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问题 单项选择题

The main purpose of the Customs supervision and control is to ( ) China's economic, trade, scientifrc, technological and cultural exchanges with other countries.

A．supervise

B．control

C．promote

D．limit

答案

参考答案：C

填空题
用方框中所给单词的适当形式填空。
nine     friend     tourist     easy     beat

1. Our neighbors are always _________ to us.
2. You can find the Capital Stadium on the map _________.
3. Today is Tony's _________ birthday. Let's go to celebrate it.
4. A lot of _________ love going to Beijing for their holidays.
5. My favorite football team was _________ in the Cup Final.

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单项选择题 A1型题

关于G蛋白的叙述，下列哪项是错误的（）

A.百日咳毒素可与B亚基结合改变其功能

B.均具有GTP酶活性

C.三聚体G蛋白位于细胞质膜内侧

D.G蛋白主要有两大类

E.在细胞信号转导中起通路开关作用
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