单项选择题

What is the probable relationship between the two speakers

A．Salesman and customer.
B．Doctor and nurse.
C．Doctor and patient.
D．Patient and patient.
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单项选择题
According to the passage, when are children first expected to study hard
A．Before 6 years of age.
B．Between 6 and 10.
C．After 10 years of age.
D．After 12 years of age.
单项选择题
About ________cars and dogs are destroyed each year.
A．6 million
B．15 million
C．30 million
D．1 million
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