单项选择题


Questions 14—16 are based on the following passage.
About how old was Chris Evert when she turned professional

A．19.
B．15,
C．17.
D．20.
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单项选择题
Which of the following is NOT an advantage of a well-spaced set of twenty to twenty four teeth
A．These teeth would work harder and become healthier.
B．Decay of teeth could not develop.
C．We would eat the diet of our ancestors.
D．Teeth can be extracted easily during childhood.
单项选择题
Where does the importance of activity of mind lie
A．In motion.
B．In people "s thinking and communication with others.
C．In people’s heart.
D．In animals’ thinking.
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