______ she reading in the classroom? [ ]
A. are
B. Does
C. Is
D. Do
答案：C
I’m afraid that no one knows_________ .
A．when will the English party begin
B．where has our English teacher gone
C．how long did the English party last
D．who will give us an English talk
锅炉本体的组成包括( )。
A．锅筒 B．锅和炉C．锅、炉和附加受热面 D．炉子
