单项选择题

The tallest trees can be found ______

A．in Muir Woods
B．Near Los Angeles
C．in San Francisco
D．Along the northern California coast
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单项选择题
______has contributed most to the redwoods survival.
A．Absence of natural enemies
B．Resistant bark and damp climate
C．Coastal isolation
D．Cool weather and daily fog
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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