单项选择题
An explosion is a sudden increase in amount（）
A.rapid burning causes it B.to be cause dby rapid burning C.causing it'burningtoberapid D.caused by rapid burning
单项选择题 Some say yes and others say no; I don't know （）to follow.
单项选择题 Shall we request the chairman（）our suggestion again?
单项选择题 She is very nice, but because she has a（）way of speaking, she is slow in making friends
