题目内容
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Which living things can use sun energy directly？
A．Animals.
B．Plants.
C．Both animals and plants.
D．All living things.
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更多“Which living things can use su…”相关的问题
Throughout history man has had to accept the fact ______ all living things must die.
A．that
B．which
C．in which
D．of which
A．lastly
B．completely
C．essentially
D．eventually
Aging is not a disease, but as a person passes maturity, the cells of the body and the【39】they form. do not function as well as they【40】in childhood and adolescence (青春期). The body provides less【41】against disease and is more prone【42】accident.
A number of related cause may【43】aging. Some cells of the body have a fairly long life, but they are not【44】when they die. As a person ages,【45】of brain cells and muscle cells decrease,【46】body cells die and are replaced by new cells. In an aging person the【47】cells may not be as viable (能生存的) or as capable【48】growth as those of a young person.
Another【49】in aging may be changes within the cells【50】. Some of the protein chemicals in cells are known【51】with age and become less elastic. This is why the skin of old people wrinkles and【52】. This is also the reason old people【53】in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as RNA, store and【54】information that the cell need. Aging may affect this【55】and change the information carrying molecules so that they do not transmit the information as well.
(66)
A．use to
B．be used to
C．used to
D．had
We may think of all of these as our needs. Yet most of us would be far from satisfied if we had nothing more than these which are supplied for us. (78) We all enjoy extra income to spend on things like books, sports or hobbies. Sometimes we save some of this extra income to pay for future expense of this type on holidays. So we must add our wants to our basic needs. Our standard of living is the degree, to which these needs and wants are satisfied.
But as time goes on, what we think of as our basic needs changes. Twenty years ago a television would have been a luxury, and still is in many countries now. Even now we cannot say it is a need in the same sense as food, clothing and shelter. Yet if most of the people of a country have one, it comes to be accepted as a need．It is possible therefore to have food, clothing and shelter and still be poor by the standards of our own society.
What we need in life is divided into ________ according to this article.
A．the basic necessities and luxury
B．many kinds of need such as food, clothing and houses
C．four groups the basic necessities, luxury, reliable income and future expense
D．the basic necessities and reliable income
Even the distinction between day and night is lost. The flow of traffic goes on unceasingly and the noise never stops.
Which is NOT one of the reasons why city life is not preferable？
A．The people are not in regular communication with the rhythm of nature.
B．The people can't enjoy sunshine and fresh air.
C．Modern cities offer better schools, more chances of employment.
D．Traffic fumes pollute the air.
We are living in an age ______ many things are done on computer．
A．which B．that C．whose D．when
Restoration of the external appearance of an extinct animal has little or no scientific value. It does not even help in inferring what the activities of the living animal were, how fast it could run, what its food was, or such other conclusions as are important for the history of life. However, what most people want to know about extinct animals is what they looked like when they were alive. Scientists also would like to know. Things like fossil shells present no great problem as a rule, because the hard parts are external when the animal is alive and the outer appearance is actually preserved in the fossils.
Animals in which the skeleton is internal present great problems of restoration, and honest restorers admit that they often have to use considerable guessing. The general shape and contours of the body are fixed by the skeleton and by muscles attached to the skeleton, but surface features, which may give the animal its really characteristic look, are seldom restorable with any real probability of accuracy. The present often helps to interpret the past. An extinct animal presumably looked more or less like its living relatives, if it has any. This, however, may be quite equivocal. For example, extinct members of the horse family are usually restored to look somewhat like the most familiar living horses — domestic horses and their closest wild relatives. It is, however, possible and even probable that many extinct horses were striped like zebras. If lions and tigers were extinct they would be restored to look exactly alike. No living elephants have much hair and mammoths, which are extinct elephants, would doubtless be restored as hairless if we did not happen to know that they had thick, woolly coats. We know this only because mammoths are so recently extinct that prehistoric men drew pictures of them and that the hide and hair have actually been found in a few specimens. For older extinct animals we have no such clues.
According to the passage, the soft part of fossilized animals
A．can always be accurately identified.
B．have usually left some traces.
C．can usually be reconstructed.
D．have always vanished without any trace.
"Are there living things in space？" " ______."
A．We have already got an answer to this question
B．We will never get an answer to this question
C．We got an answer to this question long ago
D．We may get an answer to this question in the next few years
Are we under-employed, or overburdened with too many responsibilities？ Do we have a right balance of work and leisure in our lives？ Are our relationships with family, friends or fellow workers all they should be？
All these things can be a cause of stress, and it is best to face them honestly, and to bring our frustrations into the open. People who have a good row and then forget it are doing their health more good than those who bottle up their feelings.
(85) If our self-examination has brought any causes of stress to light, let us consider what we can do about them. It is possible to change jobs. We can make more leisure and fill it more happily, if we will accept a different living standard. We can improve our personal relationships by a different attitude. It is we who allow other people to make ourselves unhappy. Often the little things that disturb us are not worth an hour's anger. The teaching in the Bible "Let not the sun go down upon your wrath" is good advice from the health point of view as well as the religious.
Which of the following statements is TRUE？
A．Freedom from responsibilities helps relieve stress.
B．Stress is the direct cause of cancer.
C．The causes of stress are worthy of serious study.
D．Cancer is the number one killer in our society today.
