单项选择题

A. How to make friends.
B. What kind of friends is best.
C. What a friend should be.
D. What can we get from a friend.
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单项选择题
A. Billions of customers. B. Millions of customers. C. Ten millions of customers. D. Ten billions of customers.
A. Billions of customers. B. Millions of customers.
C. Ten millions of customers. D. Ten billions of customers.
填空题
rewarding
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