单项选择题


Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．Many students try to study the whole night before an exam.
B．Sleep may improve memory.
C．Exams may harm memory.
D．Sleep can improve listening ability.
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单项选择题
Most computer users have symptoms of CVS because of ______.
A．dry, red, or burning eyes and blurred or double vision
B．glare, poor lighting and improper workstation setup
C．not keeping their monitor two feet away from them
D．not using a computer that protects their eyes
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