Question

【题目】— Talking loudly in a library is impolite.
— In fact, we should also ________ not to cough(咳嗽) or sneeze（打喷嚏）loudly in public.
A.look after
B.be careful
C.take care of
D.look up

Answer 1

【答案】B
【解析】look after 照顾，be careful 当心，take care of 照顾，look up 查阅，根据句意“事实上，我们也应该当心不在公共场合咳嗽或者打喷嚏”可知选B。be careful not to do sth 当心不做某事。