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　　Although scientific progress leads to constant revision of ideas, one observation that has remained ______ over the years is that there are a lot of insects in the word: some 950,000 species have been identified.

　　A： robust

　　B：significant

　　C：strong

　　D：perplexing

　　E：confounding

　　F：obscure

　　答案：AC

　　Even overt deficiencies in the author's work have not ______ its respectful reception by most modern critics.

　　A：tainted

　　B： hindered

　　C：superseded

　　D： inhibited

　　E：proscribed

　　F：forbidden

　　答案：BD

　　Shifting Fortunes take a conventional approach to American union history by simply explaining the reasons behind union growth and decline in the nineteenth and twentieth centuries: it is a chronologically and thematically ______ study and nothing more.

　　A：complicated

　　B：confined

　　C：multifarious

　　D：onerous

　　E：circumscribed

　　F：taxing

　　答案：BE

　　Titan, Saturn’s largest moon, looks surprisingly ______, even though it is a cold, dimly lit world made from unknown materials.

　　A：habitable

　　B：familiar

　　C：forbidding

　　D：placid

　　E：daunting

　　F：recognizable

　　答案：BF

　　Not only is the advent of bookless or largely bookless libraries too large and powerful a change to be______, it also offers too many real advantages for it to be considered a tragedy.

　　A：understood

　　B：averted

　　C：foreseen

　　D：forestalled

　　E：endured

　　F：anticipated

　　答案：BD

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