A．revealedB．exposedC．engagedD．involved
A. revealed
B. exposed
C. engaged
D. involved
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A．asB．just asC．likeD．unlike
A. as
B. just as
C. like
D. unlike
A．ideologicalB．biologicalC．socialD．psychological
A. ideological
B. biological
C. social
D. psychological
A．acquisitionB．appreciation.C．requirementD．alternative
A. acquisition
B. appreciation.
C. requirement
D. alternative
The main idea of this passage is that ______.
A. the use of man-made materials has had harmful effects on the modern civilization
B. pollution has become a more and more serious problem which is threatening the survival of human beings
C. our technological achievements have grown rapidly in the last twenty years
D. we should not make increasing industrialization our chief aim
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