单项选择题

A．It helps to keep the eyes moist.
B．It helps the eyes absorb eye-drops.
C．It improves a person’s concentration.
D．It prevents a buildup of chemicals in the eyes.
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单项选择题
A．Ask the stewardess for change.B．Move to another part of the plane.C．Sit where there is a breeze.D．Extinguish his cigarette.
A．Ask the stewardess for change.
B．Move to another part of the plane.
C．Sit where there is a breeze.
D．Extinguish his cigarette.
单项选择题
A．The disadvantages of working in an office.B．How using a computer can affect one’s eyes.C．Why Tom needs to get glasses.D．Research Tom has done for his chemistry paper.
A．The disadvantages of working in an office.
B．How using a computer can affect one’s eyes.
C．Why Tom needs to get glasses.
D．Research Tom has done for his chemistry paper.
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