单项选择题

A．They are looking for an apartment to live m.
B．They are discussing living places and children’s education.
C．They are complaining about their children.
D．They are planning for the next Weekend.
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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
单项选择题
People should be able to come to a decision about ions in the air if they ______.
A．note their own reactions
B．move to a healthier area
C．observe domestic animals
D．watch how wealthy people behave
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