单项选择题

A．He needs another job as research assistant.
B．He asked Professor Williams for assistance.
C．He assists Professor Williams with his teaching.
D．He is doing research with Professor Williams.
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单项选择题
A．Advantages of nuclear-generated electricity.B．Nuclear-and-coal-generated electricity.C．Nuclear-generated electricity becoming one of the basic props supporting the U. S. economy.D．U. S. energy independence.
A．Advantages of nuclear-generated electricity.
B．Nuclear-and-coal-generated electricity.
C．Nuclear-generated electricity becoming one of the basic props supporting the U. S. economy.
D．U. S. energy independence.
单项选择题
A．Build big lakes to store water.B．Construct big pumping stations.C．Build small and cheap irrigation systems.D．Channel water from nearby rivers to crop land.
A．Build big lakes to store water.
B．Construct big pumping stations.
C．Build small and cheap irrigation systems.
D．Channel water from nearby rivers to crop land.
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