Questions 12 to 15 are based on the passage you have just heard.
1.[单选题]__________.- A.To determine whether our planet is warming up.
- B.To study the behaviors of some sea animals
- C.To measure the depth of the ocean.
- D.To measure the movement of the ocean.
2.[单选题]__________.- A.They were frightened and distressed.
- B.They swam away when the speaker was turned on.
- C.They swam closer to the speaker when the speaker was turned off.
- D.They swam near the speaker whether the speaker was turned on or off.
3.[单选题]_____________.- A.The sound of waves is too noisy.
- B.The experiment may pollute the water.
- C.The sound of waves may harm sea animals.
- D.The sea animals may disturb the experiment.
4.[单选题]_______________.- A.To attract more sea animals to the testing site.
- B.To drive dangerous sea animals away from the testing site.
- C.To help track the sea animals being tested.
- D.To determine how animals communicate with each other.