单项选择题

According to the speaker, what is the possible danger facing bald eagle

A．Pollution of the environment.
B．Over-killing by hunters.
C．Destruction of their natural homes.
D．A new generation of pest killers.
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单项选择题
What was Wilt Chamberlain determined to do before he retired
A．To break the previous records.
B．To buy a luxury house.
C．To win one more championship for his team.
D．To play against the New York team once again.
问答题
然而，那些可能成为法则的带有普遍性的论断，是由特定历史时期流行的科学理论决定的。
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