单项选择题

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

A. It is a kind of airplane.
B. It is a one-person underwater vehicle.
C. It is a one-person vehicle on the sea.
D. It is a warship.

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单项选择题

单项选择题

A. Keep it waterproof.B. Keep it cool in summer.C. Communicate with other birds of the same species.D. Allow it to fly.

A. Keep it waterproof.
B. Keep it cool in summer.
C. Communicate with other birds of the same species.
D. Allow it to fly.

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