问题
选择题
直线y=
|
答案
易求双曲线的渐近线方程为：y=±
x，
当m=0时，直线y=
x+m为其中一条一渐近线，显然与双曲线无交点；
当m≠0时，直线y=
x+m与其一渐近线平行，由双曲线的性质知此时直线y=
x+m与双曲线有一个交点，
故直线y=
x+m与双曲线的交点个数有一个或0个，
故选D．
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直线y=
|
易求双曲线的渐近线方程为：y=± x，
当m=0时，直线y=x+m为其中一条一渐近线，显然与双曲线无交点；
当m≠0时，直线y=x+m与其一渐近线平行，由双曲线的性质知此时直线y= x+m与双曲线有一个交点，
故直线y=x+m与双曲线的交点个数有一个或0个，
故选D．
| 阅读理解。 |
| Years ago,I lived in a building in a large city. The building next door was only a few feet away from mine. There was a woman who lived there and whom I had never met, yet I could see her sitting by her window each afternoon, sewing (缝纫) and reading. After several months had gone by, I began to notice that her window was dirty. Everything was unclear through the dirty window. I would say to myself, "Why doesn't that woman clean her window? It really looks terrible." One bright morning I decided to clean my flat,including cleaning the window. Late in the afternoon after I finished the cleaning, I sat down by the window with a cup of coffee for a rest. What a surprise! The woman sitting by her window was clearly seen. Her window was clean! Then it dawned on me. I had been criticizing (批评) her dirty window,but all the time I was watching hers through my own dirty window. That was quite an important lesson for me. How often had I looked at and criticized others through the dirty window of my heart, through my own shortcomings (缺点)? From then on, whenever I want to judge someone, I ask myself first, "Am I looking at him through my own dirty window?" Then I try to clean the window of my own world so that I can see others' world more clearly. |
| 1．The writer couldn't see anything early through the window because ______. |
[ ] |
| A．the woman's window was dirty B．his window was dirty C．the woman lived far away D．he was near-sighted (近视的) |
| 2．After the writer finished the cleaning he was surprised to find that ______. |
[ ] |
| A．the woman was sitting by her window B．the woman's window was still dirty C．the woman was cleaning her window D．the woman's window was clean |
| 3．The underlined part "it dawned on me" probably means "______". |
[ ] |
| A．I began to understand it B．it cheered me up C．I could see myself through the window D．it made me sad |
| 4．Which of the following is TRUE according to the passage? |
[ ] |
| A．Both the woman and the writer lived in a small town. B．The writer often cleaned the window. C．Both the woman and the writer worked as cleaners. D．The writer never met the woman. |
| 5．From the passage we can learn that ______. |
[ ] |
| A．one shouldn't criticize others very often B．one should often keep his windows clean C．one should judge himself before he judges others D．one should look at others through his dirty window |