单项选择题

A．To help mariners.
B．To improve ship design and sailing methods.
C．To study astronomy and mathematics.
D．To improve his own skill as a sailor.
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单项选择题
A．Headache.B．Earache.C．Toothache.D．Stomachache.
A．Headache.
B．Earache.
C．Toothache.
D．Stomachache.
单项选择题
Living outside the university has more advantages than disadvantages.
A．Y
B．N
C．NG
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