7.A.across B.to C.from D.through
8.A.valid B.enormous C.various D.proper
9.A.As soon as B.As well as C.As much as D.As possible as
10.A.shown B.exposed C.faced D.covered
11.A.but B.because C.so D.so that
12.A.get B.make C.have D.do
13.A.earth B.atmosphere C.space D.environment
14.A.pieces B.units C.parts D.elements
15.A.receive B.accept C.bring D.catch
16.A.conventional B.commonC.general D.normal
17.A.shifts B.convertsC.modifies D.varies
18.A.what B.which C.that D.why
19.A.put up with B.keep up with C.come up with D.catch up with
20.A.from B.than C.as D.away
答案与解析:
1.D
act as 充当、起 作用 ;act for 代表、代理 ;act on 按照 。本句意为大气层起到保护伞的作用。
2.C
见上题分析。
3.D
be essential for 对 来说是首要的、基础的 ,固定搭配。
4.C
只有eat与先行词food和定语从句which we 搭配。
5.D
本句意为:热不仅使我们的生产环境温度适宜,而且紫外线也能穿透大气。also一般紧跟动词;besides一般用在句前;too可用在句中,用逗号隔开。
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