铅球从运动员手中抛出后在空中飞行,若它所受的一切外力都同时消失,那么它将( )

题型:选择题

问题:

铅球从运动员手中抛出后在空中飞行,若它所受的一切外力都同时消失,那么它将(  )

A.一定做匀速直线运动

B.仍保持原来的曲线运动状态继续运动下去

C.直接落向地面

D.可能做匀速直线运动,也可能静止

考点:牛顿第一定律
题型:选择题

阅读理解。

     An old man has a very clever monkey. He gives him food and teaches him to do some things. So

the monkey likes to live with the old man. Sometimes the old man is out, and his monkey guard home

for him. One afternoon, the old man is sleeping (睡觉) on his chair under the tree at his backyard. A

mosquito (蚊子) flies around him. The monkey finds it and tries to catch the mosquito, but he can't.

And then the mosquito stops on the old man's face. The monkey is very angry, so he picks up a stone...

The mosquito is dead (死的), but the old man gets very angry with the monkey. Do you know why?

1. The old man's monkey is very ________.    

A. bad      

B. smart      

C. fat.      

D. friendly

2. Why does the monkey like to live with the old man? 

A. Because the old man can play with him.

B. Because the old man gives him clothes.

C. because the old man is good to him.

D. Because the old man's home is comfortable.

3. Where is the old man sleeping?

A. In his room.

B. Under a tree.

C. Behind a stone.

D. Near his backyard.

4. Where does the mosquito stop?

A. On the old man's leg.

B. On the old man's arm.

C. On the old man's foot.

D. On the old man's face.

5. What does the word "angry" mean in Chinese?

A. 生气的

B. 满意的

C. 疼痛的

D. 迷惑的

题型:选择题

与植物细胞相比,细菌的结构中没有 ________ ,不能进行光合作用,所以它的营养方式是________。

题型:选择题

“太息”的病机是()

A.肝气郁结

B.肝胆湿热

C.肝气犯胃

D.肝阴不足

E.肝火上炎

题型:选择题

胃肠道手术应该作哪些术前准备

A.手术前1~2天开始进流质饮食

B.术前12小时禁食

C.手术前4小时禁水

D.直肠、结肠手术前应该口服抗生素

E.手术前要保持良好睡眠

题型:选择题

裂孔性视网膜脱离裂孔(如图)最多见于()

A.颞上象限

B.颞下象限

C.鼻上象限

D.鼻下象限

E.黄斑区

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