单项选择题

What kind of training is optional for a licensed doctor

A．Two years of a premedical course.
B．Four years of medical course.
C．Two years of residency in a hospital.
D．One year or more of a specialty course.
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单项选择题
Why shouldn't you continue to take the same medicine for the same illness without your doctor's permission
A．Because some medicines may have side effects.
B．Because there will be better medicines for your illness.
C．Because your illness may become more serious.
D．Because the effect of some medicines may be lost.
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In marketing, the use of the Internet can help businesses to ______.
A．identify their competitors
B．improve their products
C．provide comprehensive service
D．change their mindset
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