问题 单项选择题

根管预备和消毒后根管充填的时机()

A.没有明显自觉症状

B.没有明显叩痛

C.无严重气味

D.无大量渗出及急性根尖周炎症状

E.以上都是

答案

参考答案:E

解析:根管适当消毒后,并不需要等症状全部消失后根充,因为反复封药消毒药物刺激可导致效果不佳。严密充填根管后轻微的症状可逐渐消除,根尖周病可逐渐愈合。但是明显的症状及渗出要先控制。

阅读理解

阅读理解。

     Two years ago my husband bought me a bicycle. If you live in a city, it is often faster than a car and

you don't have to worry about parking (停车). You can leave it anywhere. As it has a seat at the back and

a basket at the front, I can take my daughter to school, to the library, to the shops, to anywhere.

     I use it most in summer when the weather is warm and dry. It can be very unpleasant (不愉快) in winter

when it is cold and the rain is heavy.

    Of course, you must be careful on a bicycle. Accidents are not the only problems. One day I went

shopping and came back late. I found my front wheel missing. It was a long walk to the bicycle shop. Now

I have three strong locks.

    My husband uses my bicycle sometimes for short journeys. He says it is better than waiting for a bus.

He still uses his car for longer journeys. I think that all this sitting down is making him fat and lazy. On my

bike I get a lot of exercises and fresh (新鲜的) air, and this makes me feel a lot younger.

1. In a city, a bike is better than a car because _______.

A. it is much cheaper

B. it is often faster in a city

C. you don't have to worry about parking a bike

D. Both B and C

2. Why doesn't the writer like to use the bike in winter?

A. Because it is cold in winter and she would be wet when in rains hard.

B. Because she has to be very careful.

C. Because there are many accidents.

D. All of the above.

3. Which of the following is not true?

A. The writer is a mother.

B. The wheels of her bike were broken.

C. She often goes to school with her little daughter.

D. Her husband uses her bike at times.

4. Her husband uses her bike for _______.

A. long journeys

B. short journeys

C. going to work

D. going to the library

5. What's the best title (题目) for this passage?

A. My Bicycle

B. Bicycle in the city

C. A Present From My Husband

D. A bicycle

单项选择题