（）为白色粉末，有刺激性氯气味，能溶解于水，水溶液中有大量沉淀物。
A、漂白粉
B、84消毒液
C、高锰酸钾
D、汽油
参考答案：A
The taxis in this city ________ in the same color. You can see them every day.
A．are
B．has
C．is
D．have
—May I swim here?
— No, you _______. It is dangerous.
A．won’t
B．needn’t
C．mustn’t
D．don’t have to
