单项选择题

Color-blind people often find it difficult to ______ between blue and green.

A．separate
B．compare
C．contrast
D．distinguish
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单项选择题
Several banks have joined the ______ in order to give better service to their customers.
A．association
B．society
C．community
D．league
单项选择题
What is the writer's purpose in writing this passage
A．To explain how present-day reading habits developed.
B．To change people's attitudes to reading.
C．To show how reading methods have improved.
D．To encourage the growth of reading.
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