问题 单项选择题 A1/A2型题

磨牙反锁的描述为()

A.后牙颊舌向错位严重,咬合时,上颌牙舌面与下颌牙颊面接触

B.上颌牙颊面与下颌牙舌面接触

C.上颌牙颊尖与下颌牙舌尖接触

D.上颌牙舌尖与下颌牙颊尖接触

E.上颌牙颊尖与下颌牙颊尖、上颌牙舌尖与下颌牙舌颊接触

答案

参考答案:B

解析:反锁是上后牙颊尖的颊斜面在下后牙舌尖舌斜面的舌侧,面无咬合接触。

阅读理解

阅读理解。

    What do people do with their old, out-of-date but still useful computers? Most people don’t know

what to do with them. Many old computers are put away in homes. Many more are simply thrown out

with the rubbish.

     Finally, some companies are thinking of ways to bring down the number of old computers. Sony has

agreed to help recycle old Sony products(产品). Dell, Hewlett-Packard and other companies now also

t ake back some old computers.

     In some countries, laws(法规)are being passed, too. Computer companies will have to pay for

collecting and recycling their used products. And 70% of computer waste must be recycled. The idea

behind the laws is that computer companies themselves should pay the cost. That will encourage them

to make computers that are easier and cheaper to repair and upgrade(升级).

     Yet while many people are throwing away good computers, others cannot afford them at all. Hundreds of organizations(组织)are working to solve this problem. They collect and repair old computers. Some

also teach others how to repair computers.

     The computers then go to schools, charities(慈善团体)and people who need them. Giving a used

computer to one of these organizations can turn one person’s rubbish into someone else’s useful things-

and cut down on waste, too.

1. What do many people do with old computers?

A. They repair them.

B. They sell them.

C. They send them to others.

D. They stop using them.

2. How many computer companies are mentioned in the second paragraph?

A. One.

B. Two.  

C. Three.

D. Four.

3. According to the laws in some countries, computer companies must_______   .

A. collect and recycle most of their products

B. collect all their used products

C. repair and upgrade old computers        

D. make more cheaper computers

4. What do the organizations do to solve the problem of old computers?

A. Help the computer companies to collect them.

B. Repair and send them to those who need them.

C. Help people to learn to use them.

D. Turn rubbish into useful things.

5. What is the main idea of this passage?

A. Repairing old computers.

B. Encouraging to make cheap computers

C. Recycling old computers.

D. Helping those who need computers.

问答题