在5.24×3.7中，如果去掉两个因数的小数点，那么积就扩大到原来的______

用所给词的正确形式填空。

1.What should ________ (tour) take with them?

2. My sister _________ (send) me a lot of beautiful ________ (postcard) last week.

3. They ________ (leave) Panzhihua for Shanghai two days ago.

    They ________ (come) back in five days.

4. Mike ________ (ride) his bicycle to school yesterday, but Tom ________ (run).

5. I'm sorry I ________ (forget) ________ (bring) my homework here.

6. I remember _________ (close) the door, why is it open at the moment?

7. He _________ (not be) at school last night.

饺子在水中煮，怎么都不会变黄；可将饺子放在油中炸，没过多长时间，饺子就会变黄、变焦，这说明

                   的沸点比                  的沸点高。

She contributed a lot of good ideas _       the discussion.   [ ]

A. in          

B. to           

C. at           

D. for

在进行单缸断火试验时，声响无变化可能是（）。

A、活塞销响

B、曲轴轴承响

C、活塞环响

D、火花塞响

气管闭合性损伤临床表现为（）

A.气管损伤处疼痛

B.咳嗽及咯血

C.气肿

D.声嘶

E.呼吸困难