单项选择题

A．Where it is.
B．When it is open.
C．How she can go there.
D．What she can see there.
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单项选择题
A．She will do it for the man.B．The clerk is unable to do it.C．She will tell the man how to use the machine.D．She will tell the man how to find the clerk.
A．She will do it for the man.
B．The clerk is unable to do it.
C．She will tell the man how to use the machine.
D．She will tell the man how to find the clerk.
填空题
Ethylene gas is put out by means of_______________.
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