问题
选择题
若A、B两点的坐标是A（3cosα，3sinα），B（2cosθ，2sinθ），则|AB|的取值范围是（ ）
|
答案
答案：B
搜题请搜索小程序“爱下问搜题”
若A、B两点的坐标是A（3cosα，3sinα），B（2cosθ，2sinθ），则|AB|的取值范围是（ ）
|
答案：B
| 完形填空。 | ||||
| Some years ago, Chinese high school students would show their school-bags, new clothes or new pens to their classmates when the new term started, Today, however, all have 1 . If you still come back to school 2 only these things, you are falling out-of-date (过时). Students in big cities like to bring the latest high-tech things to school, and feel happy and 3 to show off (炫耀) these things to 4 . Mobile phones, MP3 players, CD players, electronic dictionaries, the list is endless. Young people think that, living in the twenty-first century, they must keep up with the 5 . They don't want to fall 6 . Besides, they think 7 they need to keep in touch with their classmates, so they need mobile phones. They also like to 8 the pop music, so they need CD players. They explain that, 9 like electronic dictionaries, these can be 10 in their study, 11 . They think that their parents should understand 12 they want these things. Foreign students will also bring some latest high-tech things when they 13 to school at the beginning of a new term. 14 , they often use the money which they made by themselves during the holiday to 15 these high-tech things that they want. | ||||
|