单项选择题

Which of the following is NOT true

A．Tile higher one climbs, the less oxygen he will breathe.
B．The higher one climbs, the more dangerous it will be.
C．The faster one climbs, the less oxygen he needs.
D．The faster one's heart beats, the thicker one's blood becomes.

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单项选择题

Why didn't men climb mountains long ago

A．Because it was very cold on mountains.
B．Because they couldn't breathe on mountains.
C．Because they were afraid of spirits and dragons.
D．Because riley were afraid of falling into the cracks.

单项选择题

This passage mainly tells us about _______.

A．the dangers of climbing high mountains
B．the evil spirits and dragons that live on mountains
C．the proper equipment needed to climb mountains
D．people who live in mountains