单项选择题

We must take part in physical labor in order to ______ ourselves more closely with the working people.

A. identify
B. incorporate
C. combine
D. involve
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In the tropic rainforest there is a wide range of species peculiar to this area.
A. specific
B. odd
C. distinct
D. familiar
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These graduates are more than obliged to the college for the happy four years of college life.
A. obligatory
B. reluctant
C. indifferent
D. grateful
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