________ of urban residents in developing countries have satisfactory sanitation services.

A. Less than 10 percent
B. Nearly all
C. Less than half
D. 70-80 percent


Answer: C

Environmental & Atmospheric Sciences

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A) turbine B) pipe C) generator D) dam E) powerhouse

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Of the alcohols with the molecular formula C4H9OH, which has the lowest boiling point?

A) 1-butanol B) sec-butyl alcohol C) tert-butyl alcohol D) isobutyl alcohol

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The duration of twilight decreases with increasing latitude, especially in summer

a. True b. False

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Minerals that have strong bonds between flat crystal surfaces tend to

A. show well-developed cleavage. B. show poor cleavage. C. cleave more easily. D. have a well-developed streak.

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