单项选择题

According to the passage, a "developmental" disability ______.

A．develops very slowly over time
B．is caused by outside forces
C．occurs in youth and affects development
D．is getting more and more severe
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单项选择题
The writer's attitude toward nuclear energy is ______.
A．indifferent
B．favorable
C．tolerant
D．negative
单项选择题
The last sentence of the passage is probably written to ______.
A．draw a conclusion
B．show the writer's attitude
C．reflect the topic
D．give an example
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