单项选择题


A．reviews
B．references
C．reactions
D．recommendations
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单项选择题
A high negative ion count is likely to be found ______.
A．near a pond with a water pump
B．close to a slowly flowing river
C．high on some barren mountains
D．near a fountain
单项选择题
By observing the behavior of animals, scientists may be able to ______.
A．prevent disasters
B．organize groups of people
C．predict earthquakes
D．control areas of California
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