单项选择题

A．Her kids will arrive home after school.
B．She is too exhausted to work.
C．She has finished her work.
D．The man does not ask her to go back to the office.
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单项选择题
Why is it warmer on the side of a hill than on the valley floor
A．Because warmer air lifts up and off the valley floor, especially on clear nights.
B．Because there is difference between the temperature.
C．Because cold wind blows down to the valley.
D．No information is mentioned in the passage.
单项选择题
A．The conversion of volcanic waste to fertilizer.B．The menace of currently dormant volcanoes around Mount Saint Helens.C．The eruption of Mount Saint Helens and its effects on the environment.D．The elimination of volcanic ash by natural means.
A．The conversion of volcanic waste to fertilizer.
B．The menace of currently dormant volcanoes around Mount Saint Helens.
C．The eruption of Mount Saint Helens and its effects on the environment.
D．The elimination of volcanic ash by natural means.
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