下列焊接钢管中（）适合用作石油天然气的管线。A、镀锌焊接钢管 B、普通碳素钢电线套

用所给词的正确形式填空。

1、—Where's my seat, John? 

     —It's next to                (I).

2、It is nice for anybody to sit in an armchair in the garden                  (read) a book

3、It's               (polite) to speak with food in mouth.

4、—You look _________ (health) than before. What's wrong with you?

     —Maybe I have eaten                  (health) these days.

5、The girl is a                (live) child and everyone likes her a lot.

6、Tell me your                 (happy), please, and you'll feel better, I'm sure.

7、Hong Kong's return to China in 1997 marked that Britain's                 (control) over Hong Kong came to

     the end.

1921年7月中共一大在上海秘密召开，由于有黄埔军校进步学生的掩护，会议得以顺利进行，完成党历史上一个生死攸关的转折。

错误：________________________________________

理由：________________________________________

当钢轨断缝小于（）时，在断缝处上好夹板，用急救器固定，在断缝前后50m范围内拧紧扣件，并派人看守，限速5km/h放行列车。

A.20mm

B.30mm

C.40mm

D.50mm

新疆的气候特点是降水_______，气候_______，大部分为_______气候。

“整天忙着，不是替梁太太弄钱，就是替梁太太弄人。”语出小说（）。