单项选择题

Now listen to the following recording and answer questions 19 to 22.

A．Blue and red light.
B．Blue and white light.
C．White light and darkness.
D．Red light and darkness.
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单项选择题
A．Learning from books.B．Learning from teachers.C．Learning from experience.D．Learning from the Internet.
A．Learning from books.
B．Learning from teachers.
C．Learning from experience.
D．Learning from the Internet.
单项选择题
A．By filling in the hole.B．By repairing the tooth.C．By using a dentist s drill.D．By using laughing gas.
A．By filling in the hole.
B．By repairing the tooth.
C．By using a dentist"s drill.
D．By using laughing gas.
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