单项选择题

A．Food.
B．A sleeping bag.
C．A canoe.
D．A tent.
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单项选择题
A．To remember grammatical rules.B．To enlarge vocabulary.C．To learn pronunciation.D．To do oral practice.
A．To remember grammatical rules.
B．To enlarge vocabulary.
C．To learn pronunciation.
D．To do oral practice.
单项选择题
A．To explain the effects of turbidity currents.B．To explain how winds cause turbidity currents.C．To remind the student about the next assignment.D．To remind the student where ocean sediments originate.
A．To explain the effects of turbidity currents.
B．To explain how winds cause turbidity currents.
C．To remind the student about the next assignment.
D．To remind the student where ocean sediments originate.
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