单项选择题

Pupils often want to sit next to their particular friend and many classroom activities involve moving about, but even relatively small alterations can make （） to the visual comfort of pupils with sight defects.

A．a difference
B．an interference
C．a modification
D．an impact

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单项选择题
The remarkable （） of life on the Galapagos Islands inspired Charles Darwin to establish his theory of evolution.

A．classification
B．variety
C．density
D．diversion
单项选择题
It was a small country house, but it was large （）urban standards.

A．at
B．for
C．by
D．from
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