空气的加湿方法一般有( )。
A．喷水加湿
B．喷蒸汽加湿
C．超声波加湿
D．近红外线加湿
参考答案：A,B,C
This photo of mine was taken ______ stood the famous Eastern Bright Pearl in Shanghai.
A．which
B．in which
C．where
D．there
I was putting on my shirt ______ my telephone rang.
A．while
B．when
C． as
D．before
