单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What is the speaker mainly discussing

A．The adaptations of the African grass mouse to its environment.
B．The sleeping habits of the African grass mouse.
C．The effect of intense sunlight on the diet of the African grass mouse.
D．The habitat of the African grass mouse.
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单项选择题
What did the study done with surgeons’ show
A．They like to have music in the operating room.
B．They solved problems better while listening to music they liked.
C．They preferred classical music.
D．They performed better when they used headphones.
单项选择题
According to the woman, where are the hydrothermal vents found
A．In caves.
B．On the ocean floor.
C．Far below the Earth’s crust.
D．Inside archaea.
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