问题 填空题
在四边形ABCD中,若
AB
=
a
AD
=
b
,且|
a
+
b
|=|
a
-
b
|,则四边形ABCD的形状是______.
答案

∵在四边形ABCD中,若

AB
=
a
AD
=
b

∴向量

a
+
b
a
-
b
分别表示平行四边形ABCD的两条对角线,

若|

a
+
b
|=|
a
-
b
|,

则表示两条对角线长度相等,

根据矩形的判定定理,我们可得四边形ABCD是矩形

故答案为:矩形

阅读理解

阅读理解。

     Michelle Wie, from America, is like a lot of other young girls in many ways. She is a good student, and

she is a good student, and she likes reading, drawing, and computers. However, in some other ways, she is

very different. She doesn't spend much time going out with friends or shopping or going to parties. She's

very busy practicing golf.

     Michelle Wie is the best woman golfer for her age in the world. She was born in 1989. In 1999, at the

age of 10, she began to win games against woman twice her age. At 13, she could hit the ball further than

most of the women in the Ladies Professional Golf Association (LPGA). At 14, she showed she could hit

the ball further than most men.

     Wie began playing golf at the age of four. When she grew older, she played about four hours a day on

weekdays and seven hours a day on weekends. Another thing that helped he was that she was tall. By the

time she was 13, Wie was six feet tall. She's a joy to watch. She has the flexibility of a dancer and also is

very strong. And its clear that she loves the game.

1. When did Michelle Wie start playing golf?

A. At 4

B. At 10

C. At 13

D. At 14

2. What does she often do after school?

A. Going out with her friends.

B. Shopping with her family.

C. Going to parties.

D. Practicing golf.

3. How long did she practice on weekends when she grew older?

A. 3 hours

B. 4 hours

C. 7 hours

D. 8 hours

4. What makes her a successful golfer?

A. Dance.

B. Practice.

C. Drawing.

D. Computers.

5. Which of the following is the best title for this passage?

A. Michelle Wie, A Good Student

B. Michelle Wie, A Young Winner

C. Women Golf Players

D. Golf Games For Women

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