单项选择题

What is the man doing

A．Booking a room for himself.
B．Registering for a conference.
C．Checking out.
D．Checking in.
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单项选择题
Lung cancer has now ______ breast cancer as a cause of death for women in the U. S.
A．overcome
B．prevailed
C．overtaken
D．conquered
单项选择题
The subject of this passage is the ______.
A．interior of the earth
B．results of volcanic action
C．work of geologists
D．formation of volcanoes
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