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问题 选择题

关于物质氧化性及还原性的强弱，下列说法中，正确的是（　　）

A．物质越易失电子，还原性越强

B．原子失电子越多，还原性越强

C．元素化合价降低越多，氧化性越强

D．物质越是易被氧化，氧化性越强

答案

A．物质越易失去电子，其还原性就越强，故A正确；

B．还原性强弱与电子转移数目无关，不能利用失去电子数目分析还原性，故B错误；

C．氧化性与化合价数目无关，不能利用元素化合价降低的多少分析氧化性，故C错误；

D．易被氧化的物质，还原性强，符合优先氧化的规律，故D错误；

故选A．

阅读理解

阅读理解。

     Lucy is English. She is ten. She is a student. She is in Class Five, Grade Seven. Her teacher is Linda. She

is young. Her bedroom is very nice. In her bedroom (卧室) you can see a bed, a table, a sofa, a map, a cat

and some flowers. The bed is red. The table and the chair are yellow. The cat is black. It's under the bed.

There is a map of China. It's on the wall (墙).

1. Lucy is a student, she is _____.

A. English

B. American

C. Chinese

2. Her teacher is _____.

A. a man

B. a girl

C. a woman

3. Is the bed brown or red?

A. No, it isn't.

B. It's red.

C. It's brown.

4. What color is the cat under the bed? 

A. Black.

B. White.

C. Yellow.

5. Where is the map of China?

A. On the table.

B. Behind the door.

C. On the wall.

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多项选择题

下列哪些是《灵枢.本藏》所言卫气的功能（）。

A.适寒温

B.温分肉

C.肥腠理

D.司开合

E.充皮肤
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