问题 选择题

下列判断正确的是(  )

A.两个直角三角形相似

B.两个相似三角形一定全等

C.凡等边三角形都相似

D.所有等腰三角形都相似

答案

A中只能确定两个直角,其他角并不确定,所以不能得出其相似;

B中三角形相似,但对应边不一定相等,所以不能得出奇全等;

C中等边三角形三个角都是60°,所以只要是等边三角形,都相似,C正确;

D中等腰三角形的形状和大小都不能确定,故不能确定其相似.

所以只有C正确,故选C.

判断题
阅读理解

阅读理解。

     As the sun rose, a dewdrop (露珠) woke up.  There it sat on a leaf, catching the sunlight. Proud of its

simple beauty,  it was very happy.  Around it were other dewdrops,  some on the same leaf and some on

other leaves. The dewdrop was sure that it was the best, the most special dewdrop of them all.

     Ah, it was good to be a dewdrop.

     The  wind  blew  and  the plant began to shake,  tipping  (使倾斜)  the leaf . The  dewdrop  became

frightened as it started to move towards the edge (边缘)of the leaf. Why was this happening? Things were comfortable. Things were safe. Why did they have to change? Why? Why?

     The dewdrop  reached  the edge of th e leaf.  It was sure that this was the end.  The day had only just

begun and the end had come so quickly. It seemed so unfair. It seemed so meaningless. It tried hard to do whatever it could to stay on the leaf, but it was no use.

     Finally, it fell. Below there was a mirror. A reflection of the dewdrop seemed to be coming up to meet

it.  Closer and closer they came together until finally.., the small dewdrop became a part of the great pond (池塘). Now the dewdrop was no more, but it was not destroyed. 

     It had become one with the whole.

1. According to Paragraph 1, we know that the dewdrop _____.

A. didn't get on well with other dewdrops

B. thought its beauty was too simple

C. couldn't get any sunlight

D. thought itself as the best dewdrop

2. The dewdrop became _____ as it started to move towards the edge of the leaf.

A. scared

B. happy

C. proud

D. comfortable

3. Which of the following is TRUE according to the story?

A. There was only one dewdrop on the leaf.

B. The dewdrop did nothing before falling.

C. The mirror in the story refers to the pond.

D. The dewdrop was actually destroyed.

4. What does the underlined word "reflection" mean?

A. 反映

B. 考虑

C. 沉思

D. 倒影

5. The story mainly tells us that _____.

A. we should work together against difficulties

B. people should not be too proud of themselves

C. one should work hard for his/her goals

D. it's good to become one with the whole