According to the passage, the US Department of Agriculture______.
A. is liable for the fast distribution of the Russian wheat pest
B. fails to isolate the Russian wheat aphid in limited locales
C. provides data about foreign species entering the country by regulated routes
D. is responsible for introducing harmful plants onto federal lands
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In Paragraph 3 the author says: "By every one of those tests, I'd prove myself a moron. And I'd be a moron, too. " The word "moron" here probably means______.
A. a stupid person
B. a very mean person
C. a person with high integrity
D. a person with high intelligence
If time travel became possible, ______.
A. more social crimes would happen
B. more inexplicable things would arise
C. more scientific theories would come into being
D. more students would like to go to the depths of the scientific field
It is implied in the passage that ______ in studying mathematics.
A. in every country "mathematic gene" plays a decisive role
B. in every country "mathematic gene" does not play a decisive role
C. in America "mathematic gene" plays a decisive role
D. in countries other than the U. S. "mathematic gene" plays a decisive role
According to the article, the life of Snow paralleled______.
A. the development of China's revolution
B. the construction of New china
C. the course of World War Ⅱ
D. all of the above
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