单项选择题

The current rate of annual increase in the world population is about（）

A. 9 million
B. 6 million
C. 90 million
D. 20 million

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Pet owners can earn from（）per day.

A. $100 to $200
B. $200 to $400
C. $400 to $500
D. $500 to $600
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Who else attended the concert（）

A. Some tourists.
B. Some of Eve’s friends.
C. Some high school students.
D. Some art students.
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