The U.S. Environmental Protection Agency currently recommends that regulators assume children face a risk ____ times that of adults when exposed to carcinogenic chemicals
a. 5
b. 10
c. 25
d. 50
e. 100
B
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On clear, cold winter nights, cities tend to cool more ____ than rural areas and have ____ minimum temperatures
A) slowly; higher B) quickly; higher C) slowly; lower D) quickly; lower
Russian population is densest to the ________ of the Ural Mountains
A) north B) east C) west D) south
Phytoremediation is a form of bioremediation that
a. is essentially the same, but more costly b. involves the use of photosynthetic bacteria c. produces more air pollution and is thus not as helpful d. involves the use of plants e. can only work on toxic metal leachate
The phenomenon that can sometimes be seen near the upper rim of a setting or rising Sun is called ____
a. sun pillar b. the glory c. a corona d. the green flash e. the Fata Morgana