问题 解答题

小聪和小明一起观察一个三角形,下面是他们的观察记录.小聪说:”这个三角形的三个内角很有意思,∠1+∠2=∠3.”小明说:”以这个三角形最长的边为底画高,沿着高剪开,得到两个大小形状完全一样的小三角形.”

(1)根据以上描述,你认为这个三角形是______.

A.直角三角形

B.等边三角形

C.等腰三角形

D.直角等腰三角形

E.钝角三角形

(2)你能简要写一写或者画一画,说明自己的想法吗?

答案

如图所示:

因为∠1+∠2=∠3,

则2∠3=180°,

∠3=90°,

所以∠1+∠2=90°

又因∠1=∠2=∠3=∠4

所以∠1=∠2=∠3=∠4=45°

这个三角形是一个等腰直角三角形.

故选:D.

阅读理解

阅读理解。

    This dog was born on Christmas Eve in 2002. He was different from other dogs because he was

born with only two legs. The poor dog of course could not walk and even his mother Sarah did not

want him. His first owner Michael Johnson also did not think that he could survive and he was thinking

of killing him. But then, his present owner, Jude Stringfellow, met him and wanted to take care of him.

She decided to teach and train this little dog to walk by himself. She called him "Faith".

     In the beginning, she put Faith on a surfboard (滑板) to let him feel the movement… Later she used

peanut butter on a spoon as a lure (诱惑) and reward for him for standing up and jumping around. Even

the other dog at home encouraged him to walk. Amazingly, after only six months, Faith learned to balance on his legs and jump to move forward. After further training in this snow, he could now walk like a person.

     Faith loves to walk around now. Wherever he goes, he attracts people's attention. He is fast becoming

famous on the international scene and has appeared on various newspapers and TV shows. A book named With a Little Faith is now being published about him. He was even considered to appear in one of

Harry Potter movies.

     Jude Stringfellow, his present owner, has stopped working and plans to take him around the world to

tell people "that even without a perfect body, one can have a strong will (意志)".

     Faith is a good example of the strong will and wonder of life. In life there are always unpleasant things. So, in order to feel better, you just need to look at life from another direction. I hope this message will

bring fresh new ways of thinking to everyone and that everyone will appreciate and be thankful for each

beautiful day.

1. Faith is different from other dogs because _______.

A. he doesn't have a tail

B. he has only two legs

C. he was born on Christmas Day

D. his mother loves him best

2. Faith's present owner is ________.

A. Sarah

B. Michael Johnson

C. Harry Potter

D. Jude Stringfellow

3. Which of the following is the correct order for Faith to learn to walk around like a person?

① jump to move forward

② train in the snow

③ feel the movement on a surfboard

④ balance on his legs

⑤ use peanut butter on a spoon as a reward

A. ③①④②⑤

B. ③⑤④①②

C. ②⑤③①④

D. ④⑤①③②

4. What can we learn from the passage?

A. Faith's mother can walk with two legs like a person.

B. If we don't have a perfect body, we can't be successful.

C. When we meet with difficulties, we should never give up.

D. When we have difficulties, we should wait for others' help.

选择题