单项选择题

Questions 16 to 18 are based on the passage you have just heard.

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. 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.
单项选择题
A
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