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  3. What effect does excessive positive ionization have on some people? By observing the behaviour of animals, scientists may be ab

What effect does excessive positive ionization have on some people? By observing the behaviour of animals, scientists may be ab

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问题 What effect does excessive positive ionization have on some people?
By observing the behaviour of animals, scientists may be able to ______.
选项 A、prevent disasters.
B、organize groups of people.
C、predict earthquakes.
D、control areas of California.
答案C
解析
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