单项选择题

A．Press certain points around the eyes with the fingers.
B．Look at distant objects by moving the eyes from side to side.
C．Do outdoor exercises daily.
D．Stare at a calendar on the classroom wall.
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单项选择题
A．When the plane was up in the sky.B．Ten minutes after he was sitting on board.C．Just before he fastened his seat belt.D．While he was enjoying the beauty of the sky.
A．When the plane was up in the sky.
B．Ten minutes after he was sitting on board.
C．Just before he fastened his seat belt.
D．While he was enjoying the beauty of the sky.
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