下列不属于国际货物运输保险中海上货物保险的是()。
A.平安险
B.运输险
C.水渍险
D.附加险
参考答案:B
已知|a+1|+(b+2)2=0,则a+b=( ).
You ______ be polite to the old man. [ ]
A. should
B. can't
C. might
D. mustn't