（）作为有限空间环境危险性分级和采取防护措施的依据。
A.勘察记录
B.评估检测数值
C.历史记录
参考答案：B
How many _____________ are there in the library? [ ]
A. a books
B. book
C. books
Jim never goes to the movies on Saturday, ________?
A．does Jim
B．doesn’t Jim
C．doesn’t he
D．does he
