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【简答题】
哈雷彗星绕太阳运动的轨道是一个椭圆。它离太阳最近的距离是 ,此时它的速率是 。它离太阳最远时的速率是 ,这时它离太阳的距离r2是多少?
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反馈参考答案：
举一反三
【单选题】Part 2 task2 Conversation1, question5:
A.
He may use that mechanic
B.
He may try repairing himself
C.
He will call the woman
D.
He will ask his neighbor for help
【简答题】如何判断空间点及直线是否属于一平面?
【简答题】如何判断空间点是否属于一直线?
【单选题】Part 2 task2 Conversation2, question4:
A.
It was too boring for anyone to play
B.
It would be useful in teaching the fifth graders about the balance of nature
C.
It would be too difficult for the fifith graders to play
D.
It was a very interesting game
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