单项选择题

A．Irrigating desert areas.
B．Use for cold seawater.
C．Techniques for preserving the environment.
D．The importance of conserving energy.
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单项选择题
A．They want to have an up-to-date knowledge of English.B．They learn English to find well-paid jobs.C．They know clearly what they want to learn.D．They want to change the way English is taught.
A．They want to have an up-to-date knowledge of English.
B．They learn English to find well-paid jobs.
C．They know clearly what they want to learn.
D．They want to change the way English is taught.
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