单项选择题

Why did the African nations welcome an ivory ban

A．The rate of killing has been accelerating.
B．The US government forbids imports of both raw and finished ivory.
C．They realised that the killing of elephants is a serious threat to their tourist business.
D．African people advocated an ivory ban.
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单项选择题
Which of the following is the best title for the passage
A．African Elephants and the Ivory Trades.
B．A Bid to Save the Elephants.
C．The Poachers.
D．Elephants in Danger.
单项选择题
What's the author's attitude
A．Subjective.
B．Neutral.
C．Pessimistic.
D．Active.
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