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

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

A. interesting
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C. was
D. in their
单项选择题
Birds (whose) coloring blends in with the leaves (do not) seen (as easily as) (those) with brighter feathers.（）

A. whose
B. do not
C. as easily as
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