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问题 单项选择题

将细胞内的分泌泡或其他某些膜泡中的物质通过细胞质膜运出细胞的过程称为（）。

A.胞吐作用

B.内化作用

C.胞吞作用

D.吞噬作用

E.受体介导的内吞作用

答案

参考答案：A

单项选择题

When we want to tell other people what we think, we can do it with the help of words. We can also do it in many other ways, too. Sometimes we move our heads up and down when we want to say "yes", and we shake our heads when we want to say "no " Some people can’t hear or speak. They talk with the help of gestures(手势). People from other countries often have to do it if they don’t know your language.
Here is a story. An American was once having his holiday in Italy, but he could not speak Italian. One day he went to a restaurant and sat down at a table. When the waiter came, the American opened his mouth, put his fingers in it and took them out again. In this way he wanted to say "Bring me something to eat". The waiter soon brought him a cup of tea. The American shook his head and the waiter understood that he didn’t want tea. So he took it away and brought him a glass of milk. The American shook his head again. He was very hungry now and looked sad. He was just going to leave the restaurant when another man came in. When this man saw the waiter, he put his hands on his stomach (胃). In a few minutes there was a large plate of bread and meat on the table in front of him.

Sometimes people move their heads ______ when they want to say "yes".

A．right and left

B．fast and slow

C．hard and easy

D．up and down
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单项选择题

下列说法中，不属于珠江三角洲地区工业化与城市化发展中出现的问题是（）

A.生态环境形势严峻

B.人地矛盾加剧

C.产业升级速度加快

D.城市重复建设突出
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