[单项选择]To prove their theories, scientists must ______ an adequate amount of data as evidence.


A. stimulate
B. reproduce
C. reserve
D. accumulate

[单项选择]To prove their theories, scientists must ______ an adequate amount of data as evidence.


A. stimulate
B. reproduce
C. reserve
D. accumulate

[单项选择]Scientists are eager to talk with other scientists working on similar problems．


A. 科学家热衷于与从事类似课题研究的其他科学家交流。
B. 科学家更容易与其他科学家谈话来解决相同的问题。
C. 科学家很乐意在解决类似问题时同其他科学家交流。
D. 科学家更容易就雷同的问题与其他科学家交谈。

[单项选择]Medical scientists believe that


A. tests have been designed to settle the cholesterol dispute
B. drugs have been tested to reduce the amount of the substance in blood
C. low cholesterol foods or anti-cholesterol drugs or both can reduce the chance of a heart attack
D. none of the statements mentioned above is correct

[单项选择]Medal's theories on heredity
A. are only applicable to pea plants.
B. are only applicable to animals.
C. are applicable to all forms of life.
D. are only applicable to humans,

[单项选择]Why may partial theories be completely wrong

[单项选择]How many theories does the author mention
A. One
B. Two
C. Three
D. Four

[单项选择]Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food.
A. unavoidable
B. unexpected
C. unchecked
D. unfortunate

[单项选择]Most scientists agree this outpouring contributes to global warming, which could eventually lead to coastal flooding,______weather, and widespread crop loss.
A. intensive
B. extreme
C. unpleasing
D. unique

[单项选择]The scientists began to accumulate dat


A. A． collectB. handleC. analyzeD. investigate

[单项选择]

Scientists have established that influenza viruses taken from man can cause the disease in animals. In addition, man can catch the disease from animals. In fact, a great number of wild birds seem to carry the virus without showing an evidence of illness. Some scientists concluded that a large family of influenza viruses may have evolved in the bird kingdom, a group that has been on the earth 100 million years and is able to carry the virus without contracting the disease. There is even convincing evidence to show that virus strains are transmitted from place to place and from continent to continent by migrating birds.
It’s known that two influenza viruses can recombine when both are present in an animal at the same time, the result of such recombination is a great variety of strains containing different H and N spikes. This raises the possibility that a human influenza virus can recombine with an influenza virus from a low animal to produce an entirely new s
A. A type of wild pig
B. diseased lower animals
C. a group of migrating birds
D. a variety of means