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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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
Which of the following statements reflects information in the selection
A．The educational system and its administrators are partly to blame for the rise in the cheating.
B．The student who cheats must be at fault because the system is correct.
C．The 1960s vision of changing the world led students to conform.
D．Punishment for cheaters has always been severe in this country.
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