体育的本质属性是（）。 A.促进身心健康发展 B.娱乐性 C.教育性 D.为政治、经

阅读理解。

    Tomorrow is Mother's Day. Susan wants to give a present to her mother. Father tells her to go to the

shop and try to find something. Susan hurries (匆忙) to the shopping center (中心) and goes to the women's

store. She has ＄3.00. First she thinks she will get her mother something to wear. Then she thinks she will

buy something for her to use (使用).

    But she only has ＄3.00. She can't buy the nice dress. She sees a nice red hat (帽子). She knows her

mother will like it. But it is too expensive (贵的). It is ＄10.00.

    The saleslady looks at her and then looks at the hat. She takes off(取下) the price tag (标签) and says,

"That's exactly (恰好) ＄3.00."

1. Why does Susan want to give a present to her mother? [ ]

A. She loves her mother.

B. Her father asks her.

C. Tomorrow is Mother's Day.

D. She is a good girl.

2. Where does Susan go? [ ]

A. To the shop.

B. To a book shop.

C. To the women's store.

D. To the supermarket.

3. How much money does Susan have? [ ]

A. ＄3.00.

B. ＄10.00.

C. ￥3.00.

D. ￥10.00.

4. What is the price on the price tag? [ ]

A. ＄3.00.

B. ￥3.00.

C. ＄10.00.

D. ￥10.00.

5. Why doesn't Susan buy the dress? [ ]

A. She doesn't like it.

B. Her mother doesn't like it.

C. The dress is not beautiful.

D. She doesn't have much money (钱) with her.

美国科学家文卡特拉曼·拉马克里希南、托马斯·施泰茨和以色列科学家阿达·约纳特三人因“对核糖体结构和功能的研究”共同获得2009年的诺贝尔化学奖。下列有关核糖体的叙述正确的是 [ ]

A．原核细胞不存在核糖体

B．核糖体是由蛋白质和DNA构成的，它的形成与细胞核内的核仁有关

C．核糖体是氨基酸脱水缩合反应的场所，在其中形成了肽键

D．核糖体与基因的表达密切相关，是转录和翻译的场所

出现病理性缩复环最常见的情况是()

A．子宫畸形

B．子宫收缩乏力

C．强直性子宫收缩

D．骨盆出口狭窄

E．臀位

silicosis (矽肺)

用万用表电阻挡测量一只二极管的电阻，先测量读数大，反过来测量读数小，则大的为正向电阻，小的为反向电阻。（）