1.广口瓶被称为气体实验的“万能瓶”，是因为它可以配合玻璃管和其它简单仪器组成各种功能的装置。下列各图中能用作防倒吸安全瓶的是　　　　　　　　

100. - What’s the matter?　 - The shoes don’t fit properly. They _____ my feet.

A. are hurting　　　 B. will hurt　　　 C. have hurt　　　 D. are hurt

99. In this experiment, they are woken up several times during the night, and asked to report what they _____.

A. had just been dreaming　　　　　　　 B. are just dreaming

C. have just been dreaming　　　　　　　 D. had just dreamt

98. When he was alive, the old scientist used to say that knowledge ____ from practice and he gained his experience by doing a lot of practical work.

A. was coming　 　 B. had come　 　　 　　C. comes　　 　　　 　D. would come

97. She _____ to the office than she got down to writing the report.

A. has no sooner got B. had hardly got　 C. no sooner got　 D. had no sooner got

96. He _____ articles for our wall-newspaper these three years, and he _____ about forty articles.

A. has been writing； has written　　　 B. has been writing； wrote

C. is writing； has been writing　　　 　　　 D. has written； has written

95. - Look at the black clouds. It ____ soon.

- Sure. If only we ____ out.

A. is raining； didn’t come　　　　　　 B. is to rain； won’t start

C. will rain； haven’t started　　　　 D. is going to rain； hadn’t come

94. The children ____ very quiet；I wonder what they ____ up to.

A. were； are being B. are being；are　　 C. are；do　　　 　　　　 D. are being；do

93. Jim talked for about half an hour yesterday. Never ____ him talk so much.

A. I heard　　　 　 B. did I hear　　 　 C. I had heard　 　　 D. had I heard

92. -____ Betty this morning?

- Not yet, but she is sure to be here before noon.

A. Have you seen B. Will you see　 　 C. Do you see　 　 D. Did you see