问题 解答题

m为何值时,直线x+2y-3=0与圆x2+y2+x-6y+m=0相离?

答案

M的取值范围为.

将直线方程x=3-2y代入x2+y2+x-6y+m=0得5y2-20y+12+m=0.

∵直线与圆相离,

∴Δ=400-20(12+m)<0,得m>8.

又知方程x2+y2+x-6y+m=0表示圆的条件为D2+E2-4F>0,即37-4m>0,

.

故满足条件的M的取值范围为.

完形填空

Do you think of your parents? “Yes,of course,” you may answer,“I buy a present for my mother on Mother’s Day.And I give my father a present on Father's Day, ① .” Then what about the other days of a year? Always remember to think of your parents,not just on some important days.

I have a friend who lives alone,because her parents live in another city. One day I went to see her. We had a nice chat. Then she wanted to make a call.She dialed(拨)the number,but then she put the phone down.After about ten seconds,she dialed the number  ②  . “Hi,Mum…”

Later I asked,“Why did you dial the number twice?” She smiled,“My parents are old. They can't get close to the telephone quickly . I always do so when I call them. ③I just want to give them enough time to answer the call.”

My friend is a good girl. She is always thinking about her parents. You also want to be a good child, right? So why not learn from her?

小题1:将①②处填上适当的单词 ___________    ______________

小题2:将第③翻译成中文。

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小题3:回答问题: How many times does the friend dial the number?

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小题4:在文章中找出同义句:We have a good time chatting.

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小题5:找出本文的中心句。

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