单项选择题

A．who
B．and
C．then
D．therefore
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单项选择题
How much does a camel drink when it does drink
A．Very little.
B．Enough to last for three or four months.
C．As much as it has lost.
D．Enough to last until the next oasis.
单项选择题
Which of the following is NOT the duty of the lab instructor
A．Taking care of the students’safety.
B．Grading their lab notebooks.
C．Helping set up the experiments.
D．Giving them lectures on physics.
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