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A．Because he came up with solutions in a most natural way.
B．Because he lacked some of the qualities required of a scientist.
C．Because he had a great deal of trouble doing mental arithmetic.
D．Because he just read about other people’s observations and discoveries.
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单项选择题A．He thought Dr. Parker’s tests were easy.B．Dr. Parker is no longer teaching history.C．The woman’s source of information is reliable.D．He didn’t enjoy taking history tests of Dr. Parker’s.

A．He thought Dr. Parker’s tests were easy.
B．Dr. Parker is no longer teaching history.
C．The woman’s source of information is reliable.
D．He didn’t enjoy taking history tests of Dr. Parker’s.

单项选择题A．Different Forms of ExerciseB．Exercise—The Road to HealthC．Running—A Popular Form of SportD．Scientific Evidence of Health Benefits

A．Different Forms of Exercise
B．Exercise—The Road to Health
C．Running—A Popular Form of Sport
D．Scientific Evidence of Health Benefits