单项选择题

When light illuminates an object, part of it is absorbed and part reflected; the () lightness of an object depends on the proportion of light that is reflected.

A. denoted
B. embodied
C. insulated
D. perceived

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单项选择题
The world is facing the () of water shortages caused by population growth, uneven supplies of water, pollution, and other factors.

A. prospect
B. insight
C. location
D. anticipation
单项选择题
The landscape of the American West was dramatically altered during the 20th century as a result of the () construction of dams along major rivers.

A. degenerative
B. widespread
C. advancing
D. extensive
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