单项选择题

(After) the (development) (of) the steam engine by James Watt in the late 1700s, the Industrial Revolution progressed (forward) rapidly.（）

A. After
B. development
C. of
D. forward

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单项选择题

Good research involves (more) merely (gathering) information; (it) is (essentially) a thinking activity.（）

A. more
B. gathering
C. it
D. essentially

单项选择题

The main boyhood (interesting) of (psychologist) Jean Piaget (was) the observation of animals (in their) natural habitat(栖息地).（）

A. interesting
B. psychologist
C. was
D. in their

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