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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How many of the emigrants died after being thrown into the sea
A．15 of them.
B．3 of them.
C．100 of them.
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A．He firmly believes in UFOs.
B．He is doubtful about UFOs.
C．He is sure many people have seen UFOs.
D．He thinks many people have lied about UFOs.
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