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The level of lead contamination in United States riv- ers

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Senior Manager
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The level of lead contamination in United States riv- ers [#permalink] New post 08 Apr 2004, 03:10
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:54) correct 0% (00:00) wrong based on 1 sessions
15. The level of lead contamination in United States riv-
ers declined between 1975 and 1985. Federal regula-
tions requiring a drop in industrial discharges of lead
went into effect in 1975, but the major cause of the decline was a 75 percent drop in the use of leaded gasoline between 1975 and 1985.

Which of the following, if true, best supports the
claim that the major cause of the decline in the level
of lead contamination in United States rives was
the decline in the use of leaded gasoline?
(A) The level of lead contamination in United States
rivers fell sharply in both 1975 and 1983.
(B) Most of the decline in industrial discharges of
lead occurred before 1976, but the largest
decline in the level of river contamination
occurred between 1980 and 1985.
(C) Levels of lead contamination in rivers fell
sharply in 1975-1976 and rose very slightly
over the next nine years.
(D) Levels of lead contamination rose in those rivers
where there was reduced river flow due to drought.
(E) Although the use of leaded gasoline declined
75 percent between 1975 and1985, 80 percent
of the decline took place in 1985.
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 [#permalink] New post 08 Apr 2004, 09:46
confused bwt B and E .. but B seems better.
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shubhangi

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 [#permalink] New post 08 Apr 2004, 09:54
E seems tooo direct..........so would pick B!!
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 [#permalink] New post 10 Apr 2004, 11:16
OA is B.
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 [#permalink] New post 12 Apr 2004, 14:41
can someone post their line of reasoning?
  [#permalink] 12 Apr 2004, 14:41
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