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.
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单项选择题
A．Worry about his family.B．Check locks.C．Look after children.D．Have a look round.
A．Worry about his family.
B．Check locks.
C．Look after children.
D．Have a look round.
单项选择题
According to the passage, it would be more advantageous to pack________.
A．a light sleeping hag, pants and shorts, a heavy jacket, and a shirt
B．a light sleeping bag, two pairs of pants, and a heavy jacket
C．a light sleeping bag, two pairs of pants, and a light sweater and shirt
D．a light sleeping bag, pants and shorts, and a light sweater and shirt
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