为帮助大家在轻松愉快的氛围中掌握英语基础知识，本网站特提供以下资料，希望会带给你意想不到的收获：
PART V GRAMMAR and VOCABULARY [l5 min.]
Direction: There are twenty-five sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrases that correctly completes the sentence. Mark your answers on your answer sheet.
41. They ______ to enter the building by the back door; however, the front door was locked.
A. weren't supposed
B. were supposed
C. wouldn't be supposed
D. would be supposed
正确答案是
42. Come what ______, we're not going to make any concession to his unreasonable demands.
A. must
B. should
C. can
D. may
正确答案是
43.______, electrons are still smaller.
A. As atoms small are
B. As atoms smaller as
C. Small as atoms are
D. Smaller atoms as are
正确答案是
44. Many people who are underpaid are frightened to complain in case ______ trouble-makers.
A. they would be accused as
B. of being accused
C. they are accused of being
D. of their being accused
正确答案是
45.______ increases every year as natural habitats disappear.
A. The amount of endangered species
B. The quantity of endangering species
C. The number of endangered species
D. The majority of endangering species
正确答案是