单项选择题
In the author's estimation, there are ______ words in English.
A．more than half a million
B．at least 24 000
C．at least 80 000
D．more than a million
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单项选择题
According to the passage, you should thank others for their help, because ______.
A．they'll spend m6re time and energy to help you
B．they'll return the favor when needing help
C．they'll think what they've done is worthy
D．they'll make a strong alliance with you
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单项选择题
In Dr. Baum's opinion, a true nature reserve ______.
A．could never survive in a modern age
B．should provide building for human activities
C．should be regarded as a place where nature is protected
D．could provide special areas for tourist to enjoy
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