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问题 选择题

将方程x2-2x-3=0化为（x-m）2=n的形式，指出m，n分别是（　　）

A．1和3

B．-1和3

C．1和4

D．-1和4

答案

移项得x2-2x=3，

配方得x2-2x+1=4，

即（x-1）2=4，

∴m=1，n=4．

故选C．

单项选择题

日本药局方属于( )。

A．药品集
B．药典
C．工具书
D．专著类
E．百科类
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连词成句

连词成句。

1. play, brother, can, the, your, guitar (?)

                                               

2. can't, he, play, well, it, very (.)

                                                

3. you, play, can, chess (?)

                                               

4. sing, the, can, and, yes, I, drums, play (.)

                                               

5. to, club, art, join, want, do, you, our (?)

                                              

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