单项选择题

Animals that could not（）themselves to the changed environment perished and those that could survived.

A. change
B. adapt
C. modify
D. conform

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单项选择题
According to the passage, science and engineering courses seem to be more （） than arts courses.

A. motivating
B. varied
C. demanding
D. interesting
单项选择题
Physicists have made new discoveries that challenge our（）theories of the universe.

A. existed
B. adapted
C. accepted
D. established
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