单项选择题

Patches are ______.

A．rays
B．waves
C．spots
D．lines
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单项选择题
What is the main idea of the first paragraph
A．Very few people have the sensitivity of the blind.
B．Blind people can manage to see things , but only vaguely.
C．The eyes are not the only way of seeing.'
D．It is possible to localise the photo sensitive areas of the body.
单项选择题
According to the passage, which of the following statements can not be considered as the reason of the smelly house of the poor
A．The outdoor privy is smelly.
B．The refrigerator has gone out of order.
C．The housewife cannot afford the time to clean the mattress.
D．It is costy to bury rotting garbage.
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