Just as plant species native to regions with browsing mammals evolved many natural anti-browser defenses (such as sharp spines and toxic chemicals), so humans in malarial regions have evolved dozens of chemical defenses against malaria.
(A) so humans in malarial regions have evolved dozens of chemical defenses against malaria (B) humans in malarial regions have been evolving dozens of chemical defenses against malaria (C) there has been, in malarial regions, an evolution of dozens of human chemical defenses against malaria (D) dozens of chemical defenses against malaria have been evolved by humans in malarial regions (E) similarly, in malarial regions, humans have evolved dozens of chemical defenses against malaria
答案是A。A前有so也对吗？而且必须用so？为啥？
11-19
Although it claims to delve into political issues, television can be superficial such as when each of the three major networks broadcast exactly the same statement from a political candidate.
(A) superficial such as when each of the three major networks (B) superficial, as can sometimes occur if all of the three major networks (C) superficial if the three major networks all (D) superficial whenever each of the three major networks (E) superficial, as when the three major networks each
答案是E，C错在哪里？ 哪位高人解释一下as when从句的用法？还有plural n each后面的谓词动词应不应该用加S？
(2)as when这种用法前前面的帖子说了很多次了,你自己找找.C答案主要是逻辑意思的合理性,这个句子的意思是在强调个体,而不是整体.你仔细体会一下这两个句子的区别; (1) the three major networks all broadcast exactly the same statement from a political candidate. (2) the three major networks each broadcast exactly the same statement from a political candidate.
When you say "although" , you mean you already know something the networks are all doing, so you wouldn't say "if". A and E are different cuz grammatically, the phrase " such as" can only be followed by a noun or noun phrase but here it's an averbial clause "when each..." so A is impossible. the answer is exactly E.
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发表于 2003-10-9 15:29:00
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