单项选择题

A．Ways of getting extra credits.
B．All requirements of an M.A. degree.
C．The credit hours required for a degree.
D．Taking more optional courses.
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单项选择题
A．artificialB．provincialC．controversialD．substantial
A．artificial
B．provincial
C．controversial
D．substantial
单项选择题
The Snellen eye chart measures one’s eyesight by ______.
A．the number of lines he reads
B．the number of letter he reads
C．the distance he stands away from the chart
D．the speed at which he recognizes the letters
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