单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A. How deep they are.
B. Where earthquakes form.
C. How hot they are.
D. What purpose they serve.
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单项选择题
It can be inferred from the passage that oxygen and carbon dioxide（）

A. produce energy for breathing
B. diffuse immediately in the blood
C. penetrate slowly into the air sacs
D. travel in opposite ways in the lungs
单项选择题
A. They’d have to get permission. B. Jack wouldn’t like it. C. She thinks it might work. D. Other assistants should be consulted.
A. They’d have to get permission.
B. Jack wouldn’t like it.
C. She thinks it might work.
D. Other assistants should be consulted.
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