单项选择题

A. She could help him with the problems. B. He should go out for a while.
C. She could go out together with him. D. He should do the problems himself.
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单项选择题
A. To explain how winds cause turbidity currents. B. To remind the student where ocean sediments originate. C. To explain the effects of turbidity currents. D. To remind the student about the next assignment.
A. To explain how winds cause turbidity currents.
B. To remind the student where ocean sediments originate.
C. To explain the effects of turbidity currents.
D. To remind the student about the next assignment.
单项选择题
A. Because it is fun. B. Because they are forced to clean themselves. C. Because they’re proud of their pretty feathers. D. Because they have an instinct for cleanliness.
A. Because it is fun.
B. Because they are forced to clean themselves.
C. Because they’re proud of their pretty feathers.
D. Because they have an instinct for cleanliness.
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