The driver began to speed up to _____ fo

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问题选择题

The driver began to speed up to _____ for the hour he'd lost in the traffic jam. [ ]

A. keep up

B. take up 　

C. catch up 　

D. make up

答案

答案：D

填空题

已知x₁、x₂为方程x²+3x+1=0的两实根，则x₁²+8x₂+20=______．

单项选择题

下列程序的输出结果是( )。 #include ＜stdio.h＞ struct abc { int a, b, c, s;}; main() { struct abc s[2]={{1,2,3},{4,5,6}};int t;t=s[0].a+s[1].b;printf("%d\n",t); }

A．5

B．6

C．7

D．8