单项选择题

A．Because his watch has stopped.
B．Because his watch is slow.
C．Because his watch is fast.
D．Because his watch is lost.
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单项选择题
The article was written to explain______.
A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar weather interactions
D．the causes affecting weather
单项选择题
A．The five questions were not well designed.B．Not all the questionnaires were returned.C．Only a small number of students were surveyed.D．Some of the answers to the questionnaire were not valid.
A．The five questions were not well designed.
B．Not all the questionnaires were returned.
C．Only a small number of students were surveyed.
D．Some of the answers to the questionnaire were not valid.
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