单项选择题

A．Because students vary in needs,
B．Because teaching methods vary greatly.
C．Because schools offer different subjects.
D．Because there are different aids at school.
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单项选择题
A．They don’t like buses.B．They are always in a hurry.C．They think planes more safe.D．They find trains too crowded.
A．They don’t like buses.
B．They are always in a hurry.
C．They think planes more safe.
D．They find trains too crowded.
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