单项选择题

According to the weather report, the pollution index was________.

A．very good
B．good
C．fair
D．poor
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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
单项选择题
Many tourists visit Muir woods rather than other redwood forests________.
A．because it has no admission fee
B．because it is near San Francisco
C．because it has a good view of the coast
D．because it can be seen in one hour
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