题目内容
（请给出正确答案）
Scientists are sure that
A．the number of the whales is rising slowly by a small percentage.
B．greater scrutiny of the whale population explains the growing number.
C．the whales are in an irrevocable decline despite all their efforts.
D．the whales have other summer habitats besides Sakhalin’s offshore.
如果结果不匹配，请 联系老师 获取答案
更多“Scientists are sure thatA．the …”相关的问题
What will scientists do to make sure the poison works this time？
A. They will try some of it themselves.
B. They will use a special kind of poison.
C. They will drain the lake first.
D. They will only put the poison in the wells.
Passage Three
A group of scientists rowing toward the center of a lake saw something shocking. They turned back as fast as they could. What had they seen.？ The lake was boiling!
The group was investigating a crater lake in the mountains of St. Vincent. A crater lake is the mouth of a volcano that has been dormant for some time and has filled with water.
This particular crater was the tip of a volcano called Soufriere, which erupted last in 1902. Since that time, it had not shown any signs of action. But in the fall of 1971, mountain climbers who had hiked near the lake returned to the lowlands with strange stories. They said the water had turned yellow and was giving off a smell like burnt eggs. A seething fog was rising from the lake's surface.
Local scientists rushed to Soufriere to see if this might be the beginning of a new volcanic explosion. They found a huge black mass in the middle of the water. It was a great blob 1,000 feet long and 300 feet wide. Lava had pushed up through the bottom of the lake and formed a new island.
The investigators wanted to make sure that the volcano was safe, and that the lava would not over- flow into the surrounding countryside. But they could never reach the island to study it, because the lava was so hot that the water around it bubbled and boiled.
44. This passage is about ______.
A. mountain climbing
B. a boiling lake
C. a new volcanic island
D. a mysterious blob
Fears of "mad cow" disease spread (1)_____ the globe last week (2)_____ South Africa, New Zealand and Singapore joining most of Britain's European Union partners in (3)_____ imports of British beef. In London, steak restaurants were empty following the March 20 announcement by scientists that they had found a (4)_____ link between mad cow disease from British beef and its human (5)_____, Creutzfeldt-Jakob disease(CJD).
Efforts to reassure consumers and governments proved (6)_____. France, Germany, Italy, Finland and Greece were among countries which announced bans (7)_____ British beef shipments.
A committee of EU veterinary experts, meeting in Brussels, (8)_____ new protective measures but said transmission of the disease from cattle to humans was unproven and did not (9)_____ a general ban on British beef exports. Britain's own main consumer group advised people to (10)_____ beef if they wanted to be absolutely sure of not (11)_____ CJD which destroys the brain and is always (12)_____.
"Could it be worse than AIDS？"
The stark headline in Friday's Daily mail newspaper encapsulated the fear and uncertainty (13)_____ Britain. CJD (14)_____ humans in the same way that BSE makes cows mad—by eating away nerve cells in the brain (15)_____ it looks like a spongy Swiss cheese.
The disease is incurable. Victims show (16)_____ of dementia and memory loss and usually die (17)_____ six months.
Little is known (18)_____ sure about the group of diseases known collectively as spongiform. encephalopathies, which explains (19)_____ some eminent scientists are not prepared to (20)_____ a human epidemic of AIDS-like proportions.
A．in
B．on
C．over
D．around
Symptoms start【4】a fever over 100.4 degrees F, chills, headache or body【5】. Within a week, the patient has a dry cough, which might【6】to shortness of breath. In 10% to 200% of cases, patients require【7】ventilation to breathe. About 3.5% die from the disease. Symptoms【8】begin in two to seven days, but some reports suggest it【9】take as long as 10 days. Scientists are close to【10】a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence【11】antibiotics or anti-viral medicines help,【12】doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of【13】. Scientists aren’t sure yet, but some researchers think it’s a【14】discovered coronavirus, the family of viruses that cause some common colds.
Most cases appear to have been passed【15】droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care for them have been most likely to【16】the illness. But recent developments in Hong Kong suggest that the【17】might spread through air, or that the virus might【18】for two to three hours on doorknobs or other【19】Health experts say it is【20】, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.
(1)
A．detected
B．caught
C．disclosed
D．revealed
Part A
Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)
Few insects have inspired as much fear and hatred as the diminutive fire ants, less than half an inch long but living in colonies of more than 250,000 others. Everyone in the southern United States gets to know fire ants sooner or later by painful experience. Fire ants live in large earthen mounds and are true social insects—that means they have a caste system (division of labor), with a specialized caste that lays eggs (queen) and a worker caste of sterile females. There are several reasons that they are considered pests. About 60% of people living in areas where fire ants occur are stung every year. Of these, about 1% have some degree of allergic reaction (called anaphylaxis) to the sting. Their large mounds are unsightly and can damage mowing equipment. Fire ants sometimes enter electrical and mechanical equipment and can short out switches or chew through insulation. Finally. as fire ants move into new areas, they reduce diversity of native ants and prey on larger animals such as ground-nesting birds and turtles.
Even though fire ants are pests in many circumstances, they can actually be beneficial in others. There is evidence that their predatory activities can reduce the numbers of some other important pests. In cotton, for example, they prey on important pests that eat cotton plants such as bollworms and budworms. In Louisiana sugarcane, an insect called the sugarcane borer used to be a very important pest before fire ants arrived and began preying on it. Fire ants also prey on ticks and fleas.
Whether fire ants are considered pest or not depend on where they are found, but one thing is sure—we had best get used to living with them. Eradication attempts in the 1960s and 1970s failed for a number of reasons, and scientists generally agree that complete elimination of fire ants from the United States is not possible. A new, long-term approach to reducing fire ant populations involves classical biological control. When fire ants were accidentally brought to the United States, most of their parasites and diseases were not. Classical biological control involves identifying parasites and diseases specific to fire ants in South America, testing them to be sure that they don't attack or infect native plants or animals and establishing them in the Introduced fire ant population In the United States. Since fire ants are about 5 to 7 times more abundant here than in South America, scientists hope to reduce their numbers using this approach.
The word "caste"(paragraph 1) most probably means
A．throwing.
B．castle.
C．rank.
D．level.
The greatest thing that gene technology can do is to cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two killers. And to date, doctors have not found an effective way to cure them. But if the gene technology is applied, not only these two diseases can be cured completely, bringing happiness and more living days to the patients, but also the great amount of money people spend on curing their diseases can be saved, therefore it benefits the economy as well. In addition, human life span(寿命)can be prolonged.
Gene technology can help people to give birth to more healthy and clever children. Some families, with the English imperial(皇帝的)family being a good example, have hereditary(遗传的)dis-eases. This means their children will for sure have the family disease, which is a great trouble for these families. In the past, doctors could do nothing about hereditary diseases. But gene technology can solve this problem perfectly. Scientists just need to find the wrong gene and correct it, and a healthy child will be born.
Some people are worrying that the gene research can be used to manufacture(生产)human beings in large quantities. In the past few years, scientists have succeeded in cloning a sheep; therefore these people predict that human babies would soon be cloned. But I believe cloned babies will not come out in large quantities, for most couples in the world can have babies in very normal way. Of course, the governments must take care to control gene technology.
What does "these two killers" in the second paragraph refer to？
A．Gene technology and another treatment of the two diseases.
B．The two murderers who killed the cloned baby.
C．The two diseases of cancer and heart disease.
D．Hereditary diseases and cancer.
Scientists have found that the cause of this strange weather is that the air circulation pattern has changed and is now more variable than earlier in the twentieth century. This means that different regions of the world get long spells (持续时间) of the same type of weather, whether hot , cold, wet or windy.
However, weather experts have different views about why this has happened. One theory is that the temperature of the sea has increased. Another is that man’s activities on earth have disturbed the balance of nature.
Whatever the cause, the economics of many countries in the world depend upon the weather. And until we know exactly what effect man’s activities are having on the weather, we cannot make changes which might help. So for the moment the only answer is …wait and see!
26. Which of the following statements is TRUE according to the first paragraph？
A. We have never predicted the weather.
B. Man is now able to control the weather.
C. Strange weather has appeared only in some North American countries.
D. It has always been impossible for man to predict the weather accurately.
27. The strange weather patterns on the earth can he best described as ________.
A. steady and balanced C. likely to cause serious disasters
B. changeable but predictable D. unpredictable but favorable to man
28. The word “affecting” in Paragraph 1 can be replaced by ________.
A. yielding good crops in C. causing few losses in
B. having harmful effects on D. producing desired effects on
29. We can learn from Paragraph 2 that ________.
A. weather patterns are similar in different regions of the world
B. the air circulation pattern remains unchanged in the last century
C. our weather depends on the changes in the air circulation pattern
D. it is possible to predict weather patterns over a long period of time
30. It can be learned from this passage that ________.
A. scientists have similar opinions about the changing weather
B. no one is sure about the cause of the changing weather
C. cutting down forests has affected the climate
D. the weather will become worse in the future
However, we Americans need to become more (4)_____ about the effects those pesticides on our food. More (5)_____, we need to think about what new (6)_____ is necessary to protect ourselves from a (7)_____ too rich in Pesticide residue. If we don't demand greater (8)_____ on pesticide use, we may be surprised, dismayed, and (9)_____ horrified by the consequence of its use.
On the most obvious level, farm workers who continue to use the pesticides (10)_____ their present rate will (11)_____ serious diseases. It's no (12)_____ that farmers (13)_____ to herbicides have a six times greater risk of getting cancer. (14)_____, children who live in homes where pesticides are used have an increased chance of getting childhood leukemia(白血病).
But the farmers are not the only ones (15)_____ risk. Consumers may also suffer serious side effects from daily (16)_____ of foods tainted(污染) by pesticides. Although scientists have yet to prove the link (17)_____, they are concerned that pesticide use may be one reason for the startling increase in various forms of cancer like breast and colon(结肠) cancers.
We need new legislation that (18)_____ stricter standards governing pesticide residues in food. Much of the current legislation is based on ignorance. Simply (19)_____, we allow high levels of carcinogens in our food because we don't know for sure that they do cause cancer in humans. Yet, why should we take the risk？ If there's a chance that a pesticide causes cancer, then it should be (20)_____ from use.
A．In spite of
B．Thanks to
C．Given
D．Provided
Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth's temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.
This passage is mainly concerned with______.
A．the greenhouse effect
B．the potential effect of air pollution
C．the burning of fossil fuels
D．the probability of a new ice age
