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.

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单项选择题

Why did Shaefer put the paper under glass

A．To make things as difficult as possible.
B．To stop the reflection of heat.
C．To prevent Rose from feeling the print.
D．To stop her from cheating.

单项选择题

According to the passage the poor is always tired because ______.

A．they had chronic anemia caused from poor diet
B．they had many children
C．they had to work for twenty-two dallors a week
D．they had no one to take good care of their children