单项选择题

How were the pipes used in Hawaii

A．To transport water to higher elevations.
B．To provide air-conditioning.
C．To bring nutrients to the soil.
D．To adjust the soil temperatur
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单项选择题
What is the report mainly about
A．Irrigating desert areas.
B．Uses for cold seawater.
C．Techniques for preserving the environment.
D．The importance of conserving energy.
单项选择题
Why is it good to visit the everglades in winter
A．There fire fewer tourists.
B．The entrance fees are lower.
C．The animals are more active.
D．There are fewer insects.
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