问题 填空题

等腰三角形的两边长分别为4和8,则第三边的长度是      

答案

8

本题是考查的是等腰三角形的三边关系。当腰为4时,三边为4,4,8此时三角形不成立;当腰为8时,三边为4,8,8成立。故第三边为8。

阅读理解

阅读理解。

     There are 47 different kinds of kangaroos(袋鼠). The smallest are about a quarter of a meter long;

the biggest are taller than a man.

     Kangaroos have very long strong back legs. These are used for jumping. They also have long strong

tails (尾巴) used for resting on. Kangaroos' front legs are much shorter, and are almost like arms.

Kangaroos' heads are quite small, but their ears are quite large.

     Mother kangaroos have a pocket at the front. They have one baby each year. When it is born, the

baby kangaroo goes straight into its mother's pocket. The baby kangaroos stay there for six months.

     The biggest kangaroos stand more than 2 meters tall, and their legs are so strong that they can jump

more than 9 meters. They are very fast, and can travel at more than 50 kilometers an hour. They are very

strong, but only eat fruit, leaves and grass.

1. How many different kinds of kangaroos are there?

A. seven

B. seventy-four

C. fourty-seven

D. forty-seven

2. How large is a big kangaroo?

A. Smaller than a man

B. Bigger than a man

C. The same size as a man

D. A quarter of a meter long.

3. Does each kangaroo have a pocket?

A. Yes, it does.  

B. No, it does.

C. No, it doesn't.

D. It doesn't tell us.

4. How long does a baby kangaroo stay in its mother's pocket?

A. one month    

B. three months  

C. six months        

D. five months

5. How far can kangaroos jump?

A. More than 2 meters.    

B. More than 9 meters.

C. Less than 2 meters.    

D. Less than 9 meters.

单项选择题 A1/A2型题