单项选择题

Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．Buy a high-quality laptop.
B．Have a regular timetable.
C．Separate the keyboard and the screen.
D．Substitute the screen with a radiation-proof one.
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单项选择题
A．The man has no place to live next semester.B．The man is always late for class.C．The woman doesn’t think the dorm at campus is good.D．The woman thinks the rent of the dorm at campus is acceptable.
A．The man has no place to live next semester.
B．The man is always late for class.
C．The woman doesn’t think the dorm at campus is good.
D．The woman thinks the rent of the dorm at campus is acceptable.
填空题
Some researchers can not test their hypotheses by experiments because of ______.
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