单项选择题

The teachers mainly teach _______ in universities.

A．Biology and Mathematics
B．Biology and Physics
C．Mathematics and Physics
D．Physics and Chemistry
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How many high school students are presenting science projects in Portland this week
A．One hundred.
B．Several hundred.
C．One thousand.
D．Several thousan
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What does the word apple in tile phrase the Big Apple mean
A．An instrument.
B．A concert.
C．A theater.
D．A city.
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