3．如图在Rt△ABC中，∠C=90°∠B=30°，AB=2，

　 则AC=　　 。

2．=　　　　 　。

1．在实数 ，，　 　， ， 　中是　　　　　 无理数 。

15. The salesman showed her several bags and she chose _____one as she didn’t want to spend too much money on it .

A. the less expensive　　　 B. more expensive

C. the least expensive　 　D. most expensive

14. The Red Army overcame many difficulties during the Long march,____ the snow mountain _____the river and _____the forest.

A. over , through ,across　　 B. over ,across ,though

C. across ,through ,over　　 D. across ,over ,through

12.Ouroral _____a harbor city and it _____its beauty and people such as LiuXie,Ding Zhaoahong.

A.　 is known as ,is better known for B. is known for , is better known as

B.　 is known as, is well known for　 D. is known for , is good known as

11.Much of the country ______by forests, and wood ______and sold all over the world.

A .is covering ,is cut　 B .covers ,is cut

C .is covered ,is cut D .is covered ,is cutting

10.Guo Jingming who is a 22 years old college student_____-his novel City of Fantasy.

A.　 is known as　 B. is knowing as C. is known for D. is known as

9.Liu Yang who is a boy in Class 16 _____elected monitor last term and_____

A is; was　 B, was, is C .has been is　 D is, has been

8.　　 He is the only one of the children who _____of others behind their backs.

A speaks　 B speak　 C is speaken　 D. says