单项选择题

Why did Gates drop out of Harvard in his junior year

A．Because he could not pay the tuition.
B．Because he fell far behind others in his study.
C．Because he didn't like the subject he was majoring.
D．In order to devote his time to Microsoft.

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单项选择题

Who founded Microsoft

A．Gates and his high school friend Paul Allen.
B．Bill Gates.
C．Gates, Allen and some other students.
D．Paul Allen.

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.