单项选择题

The word "diffuses" in Para. 3 is closest in meaning to ______.

A．yields
B．starts
C．surfaces
D．travels
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单项选择题
What should a driver do when ascending
A．Rise slowly.
B．Breathe faster.
C．Relax completely.
D．Breathe helium.
单项选择题
What happens to nitrogen in body tissues if a diver ascends too quickly
A．It forms bubbles.
B．It goes directly to the brain.
C．It is reabsorbed by the lungs.
D．It has a narcotic effect.
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