单项选择题

Having two eyes, instead of one, is particularly useful for （）

A．seeing at night
B．seeing objects far away
C．looking over a wide area
D．judging distances

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单项选择题
When things far away seem indistinct, one is probably （）

A．near-sighted
B．far-sighted
C．astigmatic
D．suffering front cataracts
单项选择题
Some officials believe bird flu spread to Africa mainly due to ______.
A．the trade of farm birds
B．the waste and liquids of infected birds
C．the fact that sortie people touched sick birds or any infected part of sick birds
D．the virus changed and started spreading in some new forms
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