左上4大面积银汞合金填死髓，美观要求高，最佳修复设计是（）_爱下问搜题

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问题单项选择题 A1型题

左上4大面积银汞合金填死髓，美观要求高，最佳修复设计是（）

A.金属全冠

B.嵌体

C.烤瓷冠

D.塑料冠

E.3/4冠

答案

参考答案：C

解析：烤瓷全冠可兼顾美观和功能的修复。

阅读理解

根据图表内容,选择正确答案。

There are some easy things you can do to protect the environment and the earth. Choose ideas from
the chart and come up with a few of your own.

1	Plant flowers, grass or trees.
2	Whenever you visit a park or beach, take away what you bring there. Keep rubbish in a bag until you can put it into a dustbin.
3	Turn off the lights, TV sets when you leave the room. It can save a lot of electricity.
4	Turn off the tap when you brush your teeth. Use glass cups instead of paper cup.It can save a lot of paper.
5	Keep the doors and windows closed in winter and try not to use the air-conditioners.
6	Give your old books and magazines to a library instead of throwing them away.
7	Use both sides of paper.
8	Stop pouring dirty water into the rivers or lakes nearby.
9	Give your old clothes to poor children instead of throwing them away.
10	Encourage all your friends to do the same things.

You don't have to wait until Earth Day to do these things. Make every day as Earth Day.

1. This passage may be a ．

A. sign
B. proposal（倡议书）
C. notice

2. The writer tells us to ____in this passage.

A. pour dirty water into the river
B. do these things on Earth Day
C. save water by turning off tap while brushing our teeth

3. We can____to save paper.

A. use many paper cups
B. use both sides of paper
C. throw away old books

4.____ is not right according to the passage.

A. Turning off the lights when you leave the room
B. Using paper cups when we brush our teeth
C. Closing doors and windows in winter

5. The best title is____ ．

A. Protect Earth
B. Save Water
C. Save Money

多项选择题

毛卷云与密卷云的主要区别是（）。

A.密卷云云体厚，分布成片；毛卷云云体薄，纤细分散。

B.毛卷云的云体较密卷云整齐。

C.毛卷云常常高于密卷云。

D.密卷云中部有时有暗影，边缘部分卷云的特征明显；毛卷云整个丝条中丝缕结构和柔丝般的光泽十分明显。