题目内容

People close their windows at night in an attempt to shut( )the sound of gunfire(枪声).

A. on
B. in
C. out
D. up

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You are asking ( )_ trouble if you let your child play with fire.

A. for
B. at
C. in
D. out

实数域上的二次多项式当判别式△满足（）时不可约。

A. △<0
B. △>0
C. △<1
D. △=0

p(x)是R[x]上不可约多项式，如果p(x)的复根c是实数，那么p(x)是（）。

A. 零次多项式
B. 一次多项式
C. 四次多项式
D. 三次多项式

I had come to know that our Italian ( )had spent many years in New York.

A. personality
B. host
C. generation
D. double