问题 填空题

一个三角形中至多有______个钝角,至少有______个锐角.

答案

假设三角形中锐角的个数少于2个,那么三角形中就会出现两个或两个以上的角是钝角或直角,

两个钝角或两个直角的和加上第三个角的度数一定大于180°,这就违背了三角形内角和是180°的性质,

所以一个三角形至少有2个锐角,最多有1个钝角.

故答案为:1,2.

阅读理解

Dear Alice,

You really have two different questions here, so we’ll discuss them one at a time. Your problems at school may be a result of a number of things . You don’t say much about how these classmates get along with each other. It’s possible that all the students are feeling a little cautious(谨慎的) in the first term.

It’s also possible that the others are unkind. If this is so, you have to find out why you are the class “outsider”.

In your letter you say you often offer to help others with their work. Is it possible that your classmates don’t understand your offers? Could it seem that you were trying to “ buy” friends with these offers?

Is it possible that you took no notice of your classmates when you had your good friends near you ? They may have felt hurt at that time. It may take a time for them to believe in you if so. Try to ask one classmate directly what the problem is. If you hear a negative answer, at least you’ll know what to do.

Yours truly,

Shelia

小题1:From the letter we know that Alice was very _______.

A.lucky

B.unkind

C.clever

D.unhappy小题2: From the letter, we can conclude that ______.

A.Alice wasn’t pleased with her teachers .

B.Alice’s parents made her study too hard.

C.Alice didn’t get along well with her classmates

D.Alice didn’t want to go to school any more小题3:Which of the following is NOT true according to the letter?

A.Alice felt her classmates weren’t kind to her.

B.Alice was very warm-hearted to help her classmates

C.Alice didn’t want to get along well with her classmates.

D.Alice asked two questions in her letter

多项选择题