建筑基线上应至少设置______个基点。
A．2
B．4
C．5
D．3
参考答案：D
解方程：（1）（y+2）2=9
（2）3（x﹣5）2=2（5﹣x）
根据句意和首字母提示完成单词。
1. Sue has a great sports c________: balls, rackets and so on.
2.—Do you like math?
—No, I think it is d________.
3.—Let's play soccer.
—No, it's b________.
4. There are some tennis r________ on the floor.
5.—Let's play computer games.
—OK.That sounds i________.
