地球表面的平均重力加速度为g，地球半径为R，万有引力常量为G，_爱下问搜题

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问题不定项选择

地球表面的平均重力加速度为g，地球半径为R，万有引力常量为G，则可用下列哪一式来估算地球密度？ [ ]

A．

B．

C．

D．

答案

答案：A

阅读理解

阅读下面的短文，选择正确的答案。
What is a good friend like?

Molly	May19, 2009, 9:32pm I think a good friend likes to do the same things as me. Jack is my best friend. We both like to play the guitar after class.
Holly	May19, 2009, 9:40pm For me, a good friend makes me laugh. He or she likes to talk about something interesting and funny.
Maria	May19, 2009 9:45pm I think a good friend should be a good listener ,and he or she should keep secrets for me, that's more important for me.
Sally	May19, 2009, 9;55pm In my opinion, a good friend should have cool clothes, and he or she is popular in school. He or she should be good at sports, because I like doing sports.
Toby	May19, 2009, 10:16pm As we are students, I think a good friend should be good at schoolwork. Then we can help each other, learn from each other.
Jim	May19,2009,10:30pm I think a good friend should help each other. When I am in trouble, Kelly always help me.

1. Who can be Holly's friend?
    A. Someone who is very quiet.
    B. Someone who likes to talk about interesting things
    C. Someone who is good at schoolwork.
    D. Someone who is very cool and popular.
2. Which is Maria's opinion about a good friend?
    A. A good friend should like telling jokes.
    B. A good friend should study with her.
    C. A good friend should help her.
    D. A good friend should keep secrets for her.
3. Who wants his or her friends to do well in the schoolwork?
    A. Molly
    B. Toby
    C. Jim
    D. Sally
4.What does Jack like?
    A. Playing the guitar
    B. Sports
    C. Making others laugh
    D. Schoolwork

多项选择题

崇高与优美的关系是（）

A.形态相对，互不相同

B.截然对立，互不相容

C.明显不同，互补共存

D.相互转化，相互取代

E.审美范畴的不同类型