题目内容

n. a person that you are playing or fighting against in a game, competition, argument, etc..

A. opponent
B. nitrogen
C. nuisance
D. missile

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n. a situation, an event, etc.. that makes it difficult for you to do or achieve sth.; an object that is in your way and that makes it difficult for you to move forward

A. obstacle
B. permanent
C. moisture
D. outlet

v. to have to pay sb. for sth. that you have already received or return money that you have borrowed

A. owe
B. overlook
C. omit
D. noble

n. the political and economic theories of Karl Marx (1818-83) which explain the changes and developments in society as the result of opposition between the social classes

A. missile
B. materialism
C. marble
D. Marxism

adj. expecting good things to happen or sth. to be successful; showing this feeling

A. neutral
B. optimistic
C. occasional
D. parallel