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 cheatin

单项选择题

Patches are ______.

A．rays
B．waves
C．spots
D．lines