单项选择题

A．What chemicals tears are composed of.
B．Whether crying really helps us feel better.
C．Why some people tend to cry more often than others.
D．How tears help people cope with emotional problems.
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单项选择题
A．It cost much more than its worth.B．It should be brought up-to-date.C．It calls for immediate repairs.D．It can still be used for a long time.
A．It cost much more than its worth.
B．It should be brought up-to-date.
C．It calls for immediate repairs.
D．It can still be used for a long time.
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