单项选择题

A．Write more articles.
B．Make a group of friends.
C．Take a trip.
D．Teach in Africa.
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单项选择题
A．Give up the business. B．Raise the bidding price. C．Lower the price. D．Stick to the original decision.
A．Give up the business.
B．Raise the bidding price.
C．Lower the price.
D．Stick to the original decision.
单项选择题
A．To threaten the other animals. B．To be the warning signs. C．To show the food source. D．To indicate the territorial marks.
A．To threaten the other animals.
B．To be the warning signs.
C．To show the food source.
D．To indicate the territorial marks.
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