问答题

The great singer was heard ______ an English song．
A．sing B．to sing C．being sung D．be singing

A.

B.sing
C.to
D.being
E.be

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单项选择题

电感耦合等离子体是______。
A．正负电荷相等的物体
B．正负粒子及中性粒子组成的整体呈中性的离子源
C．一种有相当电离程度，能导电产生高温的气体激发源
D．一种能燃烧产生高温火球的液体

A.正负电荷相等的物体

B.正负粒子及中性粒子组成的整体呈中性的离子源

C.一种有相当电离程度，能导电产生高温的气体激发源

—Have you moved into the new house?
—Not yet. The rooms ______ ．
A．are being painting B．are painting C．are painted D．are being painted

A.

B.are
C.are
D.are
E.are