对遮光器的要求？
参考答案：
A、遮光器必须保持一定的遮光频率。B、遮光器的透光系数要大。C、遮光器与间歇运动装置的配合必须严格同步。
Nowadays, many women, ________some are not overweight at all, are always going on diets or taking weight-loss pills, ________ are often dangerous.
A．of whom; which
B．of which; who
C．whose; which
D．who; that
古汉语中的“三五之夜，明月半墙”中的“三五”是指( )。
A．每隔三五天 B．阴历每月初五 C．阴历每月初八 D．阴历每月十五
