题目内容

There()an old man and two bodyguards standing on the platform.

A. to be
B. being
C. is
D. are

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若P（2，-1）为圆（x-1）2+y2=25的弦AB的中点，则直线AB的方程是（）。

A. x-y-3=0
B. 2x+y-3=0
C. x+y-1=0
D. 2x-y-5=0
E. A、B、C、D都不正确

She shows little regard for the feelings of others and does exactly what she wants to().

A. feeling
B. love
C. consideration
D. sense

-- Must I finish it before 10 o'clock -- No, you().

A. mustn't
B. needn't
C. can't
D. don't

小麦为异源六倍体作物，其x=7。所以他的单体系列可以有______种类型。

A. 42
B. 28
C. 21
D. 7