单项选择题

A．Friends.
B．Police and thief.
C．Teacher and student.
D．Tourist and guide.
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单项选择题
A．4.2 billion years ago.B．3.3 billion years ago.C．2.9 billion years ago.D．1.2 billion years ago.
A．4.2 billion years ago.
B．3.3 billion years ago.
C．2.9 billion years ago.
D．1.2 billion years ago.
单项选择题
What is said about the consequence of the rocketing drug prices in the U.S.
A．A quarter of Americans can’’t afford their prescription drugs.
B．Many Americans can’’t afford to see a doctor when they fall ill.
C．Many Americans have to go to Canada to get medical treatment.
D．The inflation rate has been more than doubled over the years.
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