单项选择题

The main idea of the first paragraph is ().

A. the danger of our world
B. the importance of conservation
C. that we’re destroying ourselves
D. that we are changing our world

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单项选择题
What could home owners do to comply with the new regulation()

A. Write a letter.
B. Ask for permission.
C. Use more electricity.
D. Install new low-soot fireplaces.
单项选择题
In the Bay Area, a family needs to earn () the amount they do in other areas.

A. twice
B. five times
C. four times
D. three times
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