足球运动员沿直线一路带球前进，球每次被踢出后在草地上做匀减速

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问题不定项选择

足球运动员沿直线一路带球前进，球每次被踢出后在草地上做匀减速运动，当球的速度减小后，运动员又赶上去再踢，下图中v－t图象最能反映这种运动情况的是[ ]

A．

B．

C．

D．

答案

答案：B

多选题

A．静止轨道卫星的向心加速度比中圆轨道卫星向心加速度大

B．倾斜同步轨道卫星从地球上看是移动的，但每天经过特定的地区上空

C．中圆轨道卫星从地球上看是移动的，但每天经过特定的地区上空

D．中圆轨道卫星的线速度大于倾斜同步轨道卫星的线速度

填空题

用所给词的适当形式填空。

1. —Why are you so _____ (excite)?

—Because we win the game.

2. Amy, _____ (not talk) in class.

3. Water is very important for us. We can't live _____ (with) it.

4. —Who is the _____ (one ) to come to school?

—Oh, it's Lily.

5. There are lots of potatoes on those _____ (shelf).

6. Do you know the girl _____ (call) Kitty?

7. Listen! Someone _____ (knock) at the door.

8. All the walkmans on the desk are those _____ (play).

9. Let him (clean) the blackboard today.

10. Miss Chen teaches _____ (we) English this term.