单项选择题

During the years from 1957 to 1976, the birth rate of the United States ______.

A．increased
B．experienced both falls and rises
C．was reduced
D．remained stable
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单项选择题
According to the passage, a teacher's duty is to ______.
A．providing students with help when necessary
B．finding out students' mistakes and correcting them
C．teaching students the essential knowledge that they will need in their future life
D．telling students the correct answers
单项选择题
Exams, grades, and marks should be abolished because children's progress should only be assessed by ______.
A．educated persons
B．the children themselves
C．teachers
D．parents
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