甲型流感主要传播途径是（）。
A、通过谈话
B、打喷嚏
C、附着在被污染物表面的飞沫
D、空气
参考答案：A, B, C
Bob _________ exercises. He’s ______ unhealthy boy.
A．hardly ever; an
B．always; an
C．usually; a
D．never; a
－Zhang Lan, have you finished the book Harry Potter ?
－Yes, it's interesting. [ ]
A. read
B. write
C. writing
D. reading
