题目内容

incentive（）

A.induce action or motivate effort
B.hard work
C.to devote one‘s heart to s
D.

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sapling（）

A.work hard
B.young tree
C.young animal

erode（）

A.be fall in trouble
B.to destroy or wear sth away gradually
C.attack abruptly

conceal（）

A.to bring great interests
B.to help others
C.to hide, to keep from being seen

proxy（）

A.superior intellectual, social, or economic status
B.an agent or a substitute
C.supremacy