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[单项选择]Which paragraph covers the main idea
A. The first.
B. The second.
C. The third.
D. The fourt
[单项选择]Which is the main idea of the first paragraph
A. Scientists know how to change desert into good land.
B. Land is becoming desert faster than scientists can change it back into good land.
C. If scientists can bring water to desert, people can live and grow food theory.
D. More and more places are becoming deserts all the tim
[单项选择]What is the main idea of the first paragraph
[单项选择]What's the main idea of the first paragraph