已知线段AB=2，AC=5，则线段BC的长x的取值范围是（ ） A．x＜7 B．

凡是在()范围内的质量差异都是偶然性因素作用的结果，属于正常范围。

A.(%26mu;-%26sigma;)～(%26mu;+%26sigma;)

B.(%26mu;-2%26sigma;)～(%26mu;+2%26sigma;)

C.(%26mu;-3%26sigma;)～(%26mu;+3%26sigma;)

D.都不是

－English is too hard for me to study well. I don’t want to learn it any more.

－Don’t        . It is useful in the future.

A．give up

B．give out

C．give away

D．give to

按要求改写下列句子。

1. I want to go to the swim club.( 改错)

I want to go to the _______.

2. He is very good at roller-skating and skateboarding.( 改为同义句 )

He does _______.

3. We're playing ball games now. ( 就划线部分提问 )

_________________________________________

4. I can play tennis at the tennis court. ( 就划线部分提问 )

_________________________________________

5.We can play ping pong with ping pong paddles. ( 就划线部分提问 )

_________________________________________

治疗急性白血病的药物中，易引起凝血因子减少的是（）

A.阿糖胞苷

B.长春新碱

C.柔红霉素

D.左旋门冬酰胺酶

E.足叶乙甙

国际劳工公约的同酬公约规定禁止()歧视的原则。

A．(A) 年龄

B．(B) 性别

C．(C) 种族

D．(D) 地域