儿童孤独症起病于（） A.通常起病于3岁以内 B.通常起病于3岁以上 C.通常起病于

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    I had a wish to go abroad for a very long time. Finally a good chance came. Now I'm studying in the USA.

My wish comes true but I am not happy here. I want to go back to China because I hate the food in the USA.

People in the USA eat a lot of bread. They also like fast food and fried chicken very much. But I don't like such

food. I like Chinese food. There are many different kinds of food in China. They are all very delicious. So, I

often go to the Chinese restaurants in America. The food there is nice but it is very expensive. The American

people also like Chinese food very much.

1. Is the writer studying in the USA?

2. How does the writer feel in the USA?

3. Why does the writer want to go back to China? 

4. Do Americans like American food or Chinese food?

5. There are many different kinds of food in China, aren't there? 

甲、乙两个工程队合做一项工程，需要16天完成，现在两队合做9天，甲队因有其他任务调走，乙队再做21天完成任务．甲、乙两队独做各需几天才能完成任务？

制备单克隆抗体常选用小鼠的哪类细胞作为饲养细胞（）

A.中性粒细胞

B.NK细胞

C.肥大细胞

D.成纤维细胞

E.腹腔细胞

倾斜井巷运输用的钢丝绳连接装置，在每次换钢丝绳时，必须用2倍于其最大静荷重的拉力进行试验。（）

党风廉政建设领导机制和工作机制是（）。

A、党委统一领导

B、纪委组织协调

C、部门各负其责

D、动员官兵支持和参与