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Active transport:

答案

参考答案：

主动转运 active transport The movement of substances across the membrane occurs against the electrochemical gradient with the necessity of consumption of metabolic energy.

阅读理解

阅读理解

     This is Peter.  He is an Australian boy. He's going to show the Browns around London tomorrow.

     London is his favorite city. He lives there and works there. He knows London very well and he likes it very much.

There are some famous places Hyde Park (海德公园), the Big Ben(大本钟), Bucking-ham Palace( 白金汉宫) and so

on(等等).

     Mr Brown doesn't know it very well. The Browns are from Scotland. Peter's parents live in London, too. And they

are Mr and Mrs Brown's good friends. Peter has plans for tomorrow. He's going to take them to Buckingham Palace in

the morning, then the Big Ben in the afternoon.

1. Peter is from _____.

A. Japan

B. Italy

C. India

D. Australia

2. Peter is going to show _____ around London.

A. Mr Brown

B. Mrs Brown

C. the Browns

D. Mr Brown's friends

3. Peter _____ in London.

A. works and lives

B. works and plays

C. visits and eats

D. plays and visits

4. _____ doesn't know London very well.

A. Peter

B. Peter's father

C. Mrs Brown

D. Mr Brown

5. The Browns live _____.

A. in London

B. in Scotland

C. in Buckingham Palace

D. in India
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多项选择题

局部通风机的工作方法有（）。

A、压入式

B、抽出式

C、混合式

D、引射器式
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