A. Many scientists could be expected to disagree with it
B. evidence to support the theory has recently been found.
C. The theory is no longer seriously considered.
D. Most scientists believe the theory to be accurate.
Đáp án là A. Ý trong bài: The periodic extinction might be due to intersection of the earth’s orbit with a cloud of comets, but this theory is purely speculative (hoàn toàn suy đoán).
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