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单项选择题
A．A scientist will help to wire all the schools.B．It can be very expensive.C．It is not easy to do so.D．Technical problems are still not solved.
A．A scientist will help to wire all the schools.
B．It can be very expensive.
C．It is not easy to do so.
D．Technical problems are still not solved.
单项选择题
A．They are never effective.B．They are simple to perform.C．They are not always very easy.D．They are usually valid.
A．They are never effective.
B．They are simple to perform.
C．They are not always very easy.
D．They are usually valid.
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