单项选择题

Questions 14 to 17 are based on the following dialogue. Why does John want to buy a bicycle

A．To replace his stolen bicycle.
B．To begin bicycling to work.
C．To join a bicycle club.
D．To train for a bicycle race.
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单项选择题
Why did the resistance of insects to man - made insecticides develop so rapidly
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects are using the mechanisms against poisons produced by plants to. deal with insecticides.
D．Because insects have been eating plants for many million years.
单项选择题
What does the man who was buying stock trying to show
A．That every penny counts.
B．He is important.
C．He is talkative.
D．That stocks are important.
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