长期酗酒的危害，不包括A．营养缺乏 B．食管炎，胃炎 C．胰腺炎 D．肝细胞坏死，肝

阅读理解。

    Helen's eyes are not very good, so she wears glasses. But she doesn't wear glasses when she is with

her friend, Jim. When Jim comes to her house to take her out, she will take her glasses off, and when

she gets back, she puts on the glasses.

    One day her mother asks her, "Helen, why don't you wear glasses when you are with Jim? He takes

you to many lovely places in his car, but you can't see anything." Helen says, "I look more lovely to Jim

when I'm not wearing my glasses and he looks better to me, too."

1. Jim comes to take Helen           . [ ]

A. to school

B. to work

C. to see lovely places

D. to his home

2. Helen doesn't wear glasses           .[ ]

A. when Jim is with her

B. when she is at home

C. when she is at school

D. in the evening

3. Jim and Helen go out           . [ ]

A. by bus

B. by car

C. by bikes

D. by plane

4. Which sentence is right? [ ]

A. Helen doesn't like Jim.

B. Helen wants to look more lovely.

C. Jim doesn't like glasses.

D. Helen's mother knows Helen very much.

5. Jim looks better to Helen           . [ ]

A. when he sees everything clearly (清楚地).

B. when she sees everything clearly.

C. when he doesn't see things clearly.

D. when she doesn't see things clearly.

某单位计划购买电脑若干台，现从两家商场了解到同一型号电脑每台报价均为5000元，并且多买都有一定的优惠．甲商场优惠的条件是：第一台按原报价收费，其余每台优惠25%；乙商场的优惠条件是：每台优惠20%．设该单位计划购买电脑x台，根据题意回答下列问题：

（1）若到甲商场购买，需用______元（填最简结果）；若到乙商场购买，需用______元（填最简结果）．

（2）什么情况下两家商场的收费相同？

一个矩形线圈在匀强磁场中匀角速转动，产生交变电动势的瞬时表达式为e = 10sin4πtV ，则[ ]

A．该交变电动势的频率为2Hz

B．零时刻线圈平面与磁场垂直

C．t=0.25s时，e达到最大值

D．在1s时间内，线圈中电流方向改变100次

今本《诗经》收集的诗歌总共有（）。

A.300首

B.405首

C.205首

D.305首