单项选择题

What does the passage want to tell us

A．Bill Gates is very wealthy.
B．Bill Gates' youth.
C．Bill Gates was very diligent when he was young.
D．Bill Gates' friendship with Paul Allen.
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C
单项选择题
After noise is generated, what can be done to reduce human exposure to noise according to the second paragraph
A．Replacing noisy products.
B．Moving people out of the noisy place.
C．Setting up laws to keep from getting worse.
D．Using sources to reduce noise.
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