单项选择题

A．Both of the activities aren’t very good.
B．He has no interest in doing exercise.
C．They should choose a different activity.
D．It doesn’t matter which activity to choose.
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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．How deep they are. B．Where earthquakes form. C．How hot they are. D．What purpose they serve.
A．How deep they are.
B．Where earthquakes form.
C．How hot they are.
D．What purpose they serve.
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