英语课后练习题参考

上海龙凤1314 shlf　　STRUCTURE AND WRITTEN EXPRESSION

　　l. Helium is _____all gases to liquefy and is impossible to solidify at normal air pressure.

　　(A) more than difficult

上海龙凤1314 shlf　　(B) the most difficult of

上海龙凤1314 shlf　　(C) more difficult of

　　(D) most difficult

上海龙凤1314 shlf　　2. Every year Canadian ______ about 75 percent of their exports to the United States.

上海龙凤1314 shlf　　(A) businesses that sell

　　(B) selling businesses

　　(C) businesses sell

上海龙凤1314 shlf　　(D) that sell to businesses

　　3. An innovator, ballerina Augusta Maywood was _____ a traveling company.

上海龙凤1314 shlf　　(A) to form the first

上海龙凤1314 shlf　　(B) the first to form

　　(C) who formed the first

上海龙凤1314 shlf　　(D) forming the first

上海龙凤1314 shlf　　4. When water freezes in the cracks of rock, ___ expands, causing the rocks to break

　　apart.

　　(A) it

　　(B) but

　　(C) then

　　(D) and

上海龙凤1314 shlf　　5. With x-ray microscopes scientists can see through live insects ___ even through

上海龙凤1314 shlf　　solid pieces of metal.

上海龙凤1314 shlf　　(A) however

　　(B) nevertheless

　　(C) or

　　(D) yet

上海龙凤1314 shlf　　6. Dennis Chavez of New Mexico ____ to the House or Representatives in l930

上海龙凤1314 shlf　　and to the Senate in 1918.

　　(A) when elected

上海龙凤1314 shlf　　(B) elected

　　(C) who was elected

上海龙凤1314 shlf　　(D) was elected

上海龙凤1314 shlf　　7. ____ are not leached out of soil, reclamation procedures are needed to restore

　　the land s productivity.

　　(A) For concentrations of salt

上海龙凤1314 shlf　　(B) Salt concentrations that

　　(C) If salt concentrations

上海龙凤1314 shlf　　(D) With concentrations of salt

　　8. ____ social crusade aroused Elizabeth Wi1liams enthusiasm more than the

　　expansion of educational facilities for immigrants to the United States.

　　(A) No

　　(B) Nothing

　　(C) Not

　　(D) None

上海龙凤1314 shlf　　9.____ as 2500 B.C., the Egyptians used mirrors made of highly polished metal.

上海龙凤1314 shlf　　(A) In early

上海龙凤1314 shlf　　(B) As early

　　(C) Early

上海龙凤1314 shlf　　(D) Was as early

　　10. The quantum theory states ____ , such as light, is given off and absorbed in

　　tiny definite units called quanta or photons.

　　(A) energy that

　　(B) th

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