坐标轴上的点的集合可表示为

题干

坐标轴上的点的集合可表示为（）

A：{（x，y）|x=0，y=0；或x≠0，y=0}

B：{（x，y）|x²+y²=0}

C：{（x，y）|xy=0}

D：{（x，y）|x²+y²≠0}

上一题下一题 0.0难度选择题更新时间:2011-10-27 09:44:12

C

完成对话（每空词数不限）

Doctor: Hello, Larry.（1）____.

Larry: I feel terrible. I have a sore throat and a headache.

Doctor: OK. Did you take any medicine?

Larry: （2）____ I have had nothing till now.

Doctor: Well, don't worry! I don’t think you get the flu（流感）．I think it's just a cold.

Larry: OK.（3）____

Doctor: You should drink lots of water and take some Vitamin C.

Larry: All right. Is there anything else I can do?

Doctor: Well, you should go to bed early.

Larry: Should I stay off school for a few days? Should I stay in bed?

Doctor: （4）____ It's nothing serious, so （5）____ as usual.

Larry: Oh dear! I have a math exam tomorrow.

____	____	____	____	____	____
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