单项选择题

A. When he saw a motionless whale for the first time.
B. When he saw an animal for the first time.
C. When he saw a one-person underwater vehicle.
D. When he saw an airplane like craft.
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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.
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.
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.
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