问题 问答题

如图,在平面镜前有一点光源S,试用光的反射规律画出平面镜中所成像的位置.

答案

(1)从点光源S向镜面任意发出两条入射光线,入射点分别是O1、O2,根据光的反射定律,画出这两条入射光线的反射光线;

(2)将这两条反射光线反向延长,相交于点S′,点S′即为点光源S在平面镜中所成的像.如下图所示:

阅读理解

阅读理解。

    When a friend is sad about a tragedy (悲剧), it's hard to know how to comfort (安慰) him/ her. But the

worst thing you can do is say nothing. It could mean that you don't care. You don't have to say much. A

single supportive phrase doesn't require absolutely perfect words to break the ice. Here are some conversation

starters when difficult situations have your tongue tied.

1. A friend loses his baby. 

    Don't say:"Don't worry. You're so young. You'll have another baby." Do say:" I'm so sorry. I can't begin

to imagine what you are going through, but if you want to talk about it, call me anytime."

2. A guy deserts your friend.

    Don't say:"I never liked that rat bastard (坏蛋) anyway!" ( If the couple winds up reconciling (和解), you

could end up losing your friend.) Do say:"Breaking up is always hard to deal with, but I'm here for you,

whatever you need."

3. A friend has a death in the family.

    Don't say:"It's God's will." or "I know exactly how you feel." Do say:"I'm sorry about your loss. What can

I do to help?"

4. A friend loses a job suddenly.

    Don't say:" Work is always boring. Those employers didn't suit you!" Do say:" I'm sorry for that, but I

know there's an even better job waiting for you there. Let's think about possibilities."

5. Someone's pet dies.

    Don't say:"Gee! It was only a cat!" or "My roommate doesn't like her dog and she is getting rid of her dog.

Do you want it?" Do say:"I'm sorry, she was such a great cat. How long did you have it?"

1. Which of the following has the same meaning as the underlined part "have your tongue tied"?[ ]

A. make your tongue shut

B. tie your tongue in order not to say.

C. have no suitable words to say.

D. say what you want freely.

2. As a whole, what's the best way to comfort your friend troubled with a tragedy? [ ]

A. To show your sorrow and offer your help.

B. To try to make the tragedy less serious.

C. To tell your friend not to think about it any more.

D. To do your best to make him/her cheerful again.

3. Though your friend is deserted, you'd better not say dirty words about her/ his friend because _____. [ ]

A. they might get along well again and you might be deserted

B. your friend might not like you to say that against her / his friend

C. it may be a sign that you don't care for your friend

D. your friend might hate you in the future

单项选择题