题目内容
（请给出正确答案）
[主观题]
The mixing of civilized cultures is an important development in world history.
查看答案
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
更多“The mixing of civilized cultur…”相关的问题
A.fixing
B.fitting
C.mixing
D.concentrating
A.joining them
B.uniting them
C.unifying them
D.putting them together
A thermosetting polymer like epoxy______
A．typically can not be recycled.
B．usually involves the mixing of two or more components which are then polymerized.
C．is relatively strong because molecules are crosslinked together.
D．can not be easily re-shaped after curing
E．all of the above
A．They wanted to reserve some gold and silver for themselves.
B．There was neither enough gold nor enough silver.
C．New coins were easier to be made.
D．They could make money.
According to the passage, which of the following is true？______
A．Most people believe childhood leukaemia is due to environmental factors.
B．Population mixing best explains the cause of childhood leukaemia.
C．Radiation has nothing to do with childhood leukaemia.
D．Children born in a large town are at higher risk of leukaemia.
A．Radiation has contributed to the disease.
B．Putting a lot of people from rural area in a large towns increases the risk of childhood leukaemia.
C．Population mixing is the most important reason for leukaemia cluster.
D．Childhood leukaemia is caused by an unusual infection.
Part A
Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)
British cancer' researchers have found that childhood leukaemia is caused by an infection and clusters of cases around industrial sites are the result of population mixing that increases exposure. The research published in the British Journal of Cancer backs up a 1988 theory that some as yet unidentified infection caused leukaemia—not the environmental factors widely blamed for the disease.
"Childhood leukaemia appears to be an unusual result of a common infection", said Sir Richard Doll, an internationally-known cancer expert who first linked tobacco with lung cancer in 1950. "A virus is the most likely explanation. You would get an increased risk of it if you Suddenly put a lot of people from large towns in a rural area, where you might have people who had not been exposed to the infection". Doll was commenting on the new findings by researchers at Newcastle University, which focused on a cluster of leukaemia cases around the Sellafield nuclear reprocessing plant in Cumbria in northern England. Scientists have been trying to establish why there was more leukaemia in children around the Sellafield area, but have failed to establish a link with radiation or pollution. The Newcastle University research by Heather Dickinson and Louise Parker showed the cluster of cases could have been predicted because of the amount of population mixing going on in the area, as large numbers of construction workers and nuclear staff moved into a rural setting. "Our study shows that population mixing can account for the (Sellafield) leukaemia cluster and that all children, whether their parents are incomers or locals, are at a higher risk if they are born in an area of high population mixing", Dickinson said in a statement issued by the Cancer Research Campaign, which publishes the British Journal of Cancer.
Their paper adds crucial weight to the 1988 theory put forward by Leo Kinlen, a cancer epidemiologist at Oxford University, who said that exposure to a common unidentified infection through population mixing resulted in the disease.
Who first hinted at the possible cause of childhood leukaemia by infection？
A．Leo Kinlen
B．Richard Doll
C．Louise Parker
D．Heather Dickinson
Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever before and most of it is made up of the packages and cans in which we put our food. The traditional way of getting rid of solid wastes is quickly becoming inadequate. Many cities are experimenting with newer ways of handling their growing piles of garbage.
One of these new ways is "recycling"(回收使用). Through recycling usable materials are taken out of garbage and made into something else. These usable parts of garbage are put through the cycle of going from a raw material to a finished product again.
In some cities a machine called Hydrapulper is being used to help recycle garbage. A Hydrapulper is like a huge mixing machine. The garbage is dropped onto a conveyor belt (传送带) that feeds the machine. At the same time, water is pumped into the Hydrapulper. With a mixing action, the Hydrapulper throws out the heavy metal objects that can later be sold as waste metal. The rest of the garbage—paper, food, plastic, rubber, glass, wood, leaves, and other items—falls apart. The waste is then mixed with water and carried to another piece of equipment where glass, sand and small pieces of metal are thrown out.
With the Hydrapulper, up to 95 percent of the original garbage is made again useful. The rest turns into furnace ash(炉灰).
Traditionally, garbage is thought to be ______.
A．a worthless burden to big cities
B．something that can be reused
C．a raw material for making new products
D．able to be recycled but difficult to handle
