According to the passage, how many miles is the earth's diameter？
A. 2,000.
B. 4,000.
C. 8,000.
D. 16,000.
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Advance in science more often than not encounters powerful opposition, __________ Darvin's
A. as was the ease with
B. such as the case of
C. as it did with
D. as in the ease of
正确答案是（）
A. calls out
B. calls over
C. calls in
D. calls for
正确答案是（）
A. respond
B. move
C. submit
D. comply
正确答案是（）
A. to fix
B. to have fixed
C. fixing
D. to be fixed
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