单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．They could be a sign of global warming.
B．They are disturbing Antarctic bird habitats.
C．They have destroyed research facilities.
D．They contradict current scientific theories.
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单项选择题
A．Take the medicine as she was directed to do.B．Schedule another appointment with her doctor.C．Stop taking the medicine.D．Rest her back for a few days.
A．Take the medicine as she was directed to do.
B．Schedule another appointment with her doctor.
C．Stop taking the medicine.
D．Rest her back for a few days.
单项选择题
A．The need to exercise the memory.B．How the brain differs from other body tissues.C．The unconscious learning of a physical activity.D．How nerves control body movement.
A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.
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