177.
Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a secret language to communicate with other members of the herd. (A) Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used (B) Elephants emit low-frequency sounds that are believed to originate from a small area on their foreheads, and they may use this (C) Elephants emit low-frequency sounds, believed to originate from a small area on their foreheads, that they may use (D) Originating, it is believed, from a small area on their foreheads; elephants emit low-frequency sounds they may use（C） (E) Originating, it is believed, from a small area on their foreheads, low-frequency sounds are emitted by elephants that may be used 答案是c我有点不明白,a不是更好么? 180.
At the invitation of Kwame Nkrumah, W. E. B. Du Bois settled in Gharla and became the editor of the Encyclopedia Africana. (A) At the invitation of (B) When he was invited by (C) An invitation coming from (D) An invitation that came from（A） (E) After having an invitation by 不解a为什么是对的，b为什么又不对 181.
Dr. Sayre’s lecture recounted several little-known episodes in the relations between nations that illustrates what is wrong with alliances and treaties that do not have popular support. (A) relations between nations that illustrates (B) relation of one nation with another that illustrates (C) relations between nations that illustrate (D) relation of one nation with another and illustrate（B） (E) relations of nations that illustrates 压根没有太明白哪个是illustrate的主语,我选了c答案是b 199.
Personal trainers and fitness coaches are to the narcissistic 1980’s just like a private fencing master and dancing teacher was to an earlier time. (A) just like a private fencing master and dancing teacher was (B) as have been a private fencing master and dancing teacher (C) what private fencing masters and dancing teachers were (D) what private fencing masters and dancing teachers are（C） (E) just the same as private fencing masters and dancing teachers had bee 答案选c,我选了e,不知道为什么,这里的what 是什么用法,应该怎么翻译!!
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