单项选择题

How long is the shaft

A．12.5 miles.
B．23 miles.
C．less than 32 miles.
D．37 miles.
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单项选择题
What is the focus of the passage
A．The reasons for people's cry.
B．How tears are produced.
C．The function of tears.
D．The findings of Winfred.
单项选择题
What is the purpose of Winfred's research
A．The components of tears.
B．Why some people cry more often than others.
C．How tears help us deal with emotional problems.
D．Whether crying really helps people reduce stress.
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