It’s the same in China --- many people, ________ some are not overweight at all, are always going on diets or taking weight-loss pills, ________ are often dangerous.

A．whose; which

B．of which; who

C．of whom; which

D．who; that

双线区段线桥工区应配备的红色信号旗数量为（）。

A、2面

B、4面

C、6面

D、9面