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  3. Biologists agree that snakes descended from lizards, but exactly where this first happened has been a matter of debate since the

Biologists agree that snakes descended from lizards, but exactly where this first happened has been a matter of debate since the

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问题 Biologists agree that snakes descended from lizards, but exactly where this first happened has been a matter of debate since the 1800s, when two______ theories emerged.
A complex
B competing
C dubious
D conclusive
E contending
F irrefutable
选项
答案B,E
解析 The "but" that connects the two parts of the sentence indicates that the second part contrasts in some way with the first part. In this case, the contrast is between the biologists’ agreement on a central fact(snakes’ descent from lizards)and a disagreement over the details(which have long been a matter of debate). The words that best complete the blank, then, must somehow emphasize this disagreement. Of the choices, "competing" and "contending" best do so because they imply that the two theories are what the long-running debate has centered upon. Of the other choices, "conclusive" and "irrefutable" are roughly synonymous, but neither suggests a matter worthy of a long-running debate. "Dubious," in addition to having no near-synonym among the choices, would also not explain why the emergence of the two theories triggered the debate. While "complex" might well describe a theory, it too has no obvious pair among the choices, and it also does not foreground biologists’ disagreement regarding the two theories.
Thus the correct answer is competing(Choice B)and contending(Choice E).
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