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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】It __________ eight years to build the Dam(大坝) from 1998 t0 2006．A．spends B．costs C
A.
4．It __________ eight years to build the Dam(大坝) from 1998 t0 2006． A．spends
B.
costs
C.
paid
D.
took
【单选题】Text 5 The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so ...
A.
We all know that we can’t exist without air.
B.
Without air, we can’t hear anything.
C.
Men have studied electricity in the air for centuries.
D.
There’s huge energy in the air surrounding the earth.
【单选题】In some countries in which there is very little rain at any time, the farmers have to water their fields. Irrigation is easy enough if there is a great river near the crops and if there is plenty of w...
A.
the problems caused by river water
B.
the necessity to irrigate the field
C.
the water shortage in some countries
D.
the canals carrying water to fields
【单选题】The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so obvious or widely kno...
A.
will become very cold
B.
will do good to human beings
C.
will become hot
D.
will do harm to human beings