单项选择题

A. They were frightened and distressed.
B. They swam away when the speaker was turned on.
C. They swam closer to "examine" the speaker when it was turned off.
D. They didn’t seem to be frightened and kept swimming near the speaker.
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单项选择题
A. To determine whether the Earth’s temperature is going up. B. To study the behavior of some sea animals. C. To measure the depths of the ocean. D. To measure the movement of waves on the ocean.
A. To determine whether the Earth’s temperature is going up.
B. To study the behavior of some sea animals.
C. To measure the depths of the ocean.
D. To measure the movement of waves on the ocean.
单项选择题
A. Earn money to pay the rent. B. Buy furniture for the apartments. C. Sign a housing contract. D. Earn money to buy a car.
A. Earn money to pay the rent.
B. Buy furniture for the apartments.
C. Sign a housing contract.
D. Earn money to buy a car.
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