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
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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
The woman found out about the item______
A．because a salesman recommended it
B．because she saw an advertisement
C．because hex friend has one
D．because she bought one before
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