单项选择题

The phrase "the problem" (Line 3, Para. 5) refers to ______.

A．raising the status of teaching with research
B．the combination of teaching with research
C．the separation of teaching from research
D．improving the status of research

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单项选择题

Which of the following is the closest in meaning to commute in Paragraph 5, Sentence 22

A．Travel long distance regularly by train, bus and so on.
B．Speak and listen to others in communication.
C．Exchange with others for what you don't have.
D．Sleep or rest.

单项选择题

According to the passage, which of the following is NOT true

A．The internal clock of us governs our cycles of alertness and sleep.
B．The internal clock of us can produce jet lag.
C．Long time in the biological darkness is fine to Americans.
D．During the winter in the northeast of America, a person can commute roundtrip in the dark.