单项选择题

Questions 14～16 are based on the following passage What does Dr. Richard Perelman do

A．He conducts tests.
B．He writes books about children.
C．He teaches at the university.
D．He recommends house sitter.
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单项选择题
Which of the following items may not be injured by diabetes
A．Kidneys
B．Nerves.
C．Ears.
D．Eyes.
单项选择题
Who is hurt by air pollution
A．The buyer.
B．The seller.
C．Both the buyer and the seller.
D．None.
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