单项选择题

A．They haven’’t devoted as much energy to medicine as to space travel.
B．There are too many kinds of cold viruses for them to identify.
C．It is not economical to find a cure for each type of cold.
D．They believe people can recover without treatment.
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单项选择题
A．A bus accident.B．A driver’’s fault.C．Calamities and rescues.D．A successful rescue.
A．A bus accident.
B．A driver’’s fault.
C．Calamities and rescues.
D．A successful rescue.
单项选择题
A．She tried to help newcomers to her country.B．She wanted to teach English better.C．She planned to write about the evening school.D．She was interested in foreigners.
A．She tried to help newcomers to her country.
B．She wanted to teach English better.
C．She planned to write about the evening school.
D．She was interested in foreigners.
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