单项选择题

The training period lasts________.

A．two to four months
B．about three weeks
C．at least half a year
D．two years or more
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单项选择题
A．They protested against detaining boat people.B．They protested against letting them stay forever.C．They urged Vietnam to accept the boat people.D．They urged Britain to accept the boat people.
A．They protested against detaining boat people.
B．They protested against letting them stay forever.
C．They urged Vietnam to accept the boat people.
D．They urged Britain to accept the boat people.
单项选择题
The oldest documented age for a redwood tree is approximately________.
A．350 years
B．400 years
C．800 years
D．2,000 years
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