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

<上一题 目录 下一题>
热门 试题

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
D. those
单项选择题
A person who is constantly worried about the loss of （） job is not likely to do very good work.

A．his
B．their
C．one's
D．one
相关试题