问题 不定项选择

如图所示,一物块受一恒力F作用,现要使该物块沿直线AB运动,应该再加上另一个力作用,则加上去的这个力的最小值为

[ ]

A. Fcosθ

B. Fsinθ

C. Ftanθ

D. Fcotθ

答案

答案:B

阅读理解

阅读理解.

     A story is told about a soldier who was finally coming home after having fought in Vietnam. He

called his parents from San Francisco. "Mom and Dad, I'm coming home, but I've a favor to ask.

I have a friend. I'd like to bring home with me."

     "Sure," they replied, "we'd love to meet him." "He was hurt pretty badly in the fighting. He lost a

arm and a leg. He has nowhere else to go, and I want him to live with us." "I'm sorry to hear that,

son. Maybe we can help him find somewhere to live."

     "No. Mom and Dad, I want him to live with us."

     "Son," said the father, "you don't know what you're asking. Someone with such a handicap would

be a temble burden (负担) on us. We have our own lives to live, and it's very hard for us. I think you

should just come home and forget about this guy. He'll find a way to live himself."

     At that point, the son hung up the phone. The parents heard nothing more from him. A few days

later, however, they received a call from the San Francisco police. Their son had died after falling from

a building, they were told. The police believed he killed himself. The parents flew to San Francisco but

to their surprise they discovered something they didn't know — their son had only one arm and one leg.

1. Why was the man in the story hurt at the beginning?

A. Because he was hurt in an accident.

B. Because he fell from a tall building.

C. Because he went to a war.

D. Because he fought with someone.

2. Who is the wounded man that the soldier told his parents?

A. His friend.

B. The soldier himself.

C. Another soldier.

D. His brother.

3. It's _____ for the parents to help the poor man.

A. kind

B. kind-hearted.

C. unconcerned

D. careful

4. What does the underline word "handicap" mean?

A. 缺陷

B. 责任

C. 妨碍

D. 障碍

5. The passage wants to tell us we should _____ the people who in convemence us or make us feel

    uncomfortable.

A. hate

B. love

C. trouble

D. not care for

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