PT158.S1.P1.Q1 > Analytics

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A major problem facing industrial societies is their exponentially increasing production of toxic waste. █████████████ ███████████ ███ ████████ ███ █████████ ███ ████████████ ████ █████████ █████████████ ██ ██████ ██████ ███

Main Problem · Toxic waste disposal

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Solution · Deep well injection

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Details of Solution · Details of deep well injection

Waste injected into rock layers, out of reach of underground drinking water (aquifers)

problem · Three problems with deep well injection

Problem 1 · Wells can still leak into aquifers, polluting drinking water

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Problem 2 · Human error can cause wells to fail

Example of human error threatening drinking water supply

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Problem 3 · Very difficult to predict how waste will flow underground

Reiteration of 3 problems · Uncertainty of flow (problem 3), mechanical failure (problem 1), human error (problem 2)

Passage Style

Problem-analysis

Single position

Which one of the following ████ ██████████ ██████ ███ ████ █████ ██ ███ ████████

Question Type

Main point

In a Problem-Analysis passage, if the author focuses on describing why something is a problem, but does not introduce a potential solution for the problem, then the main point is that something is a problem. Here, the author focuses on why disposal of waste through deep-well injection is risky. Since the author doesn’t discuss potential solutions to this problem, we can expect the answer to capture the idea that deep-well injection of waste is risky.

Deep-well injection of █████████ ██████ ██ ██████ ████ █████████ █████████████ ████████ ███ ███ ██████

This isn’t the main point, because the author doesn’t emphasize the lack of expensive precautionary measures as a condition that would render deep-well injection of wastes unsafe. In fact, the author believes that deep-well injection of waste can be risky regardless of whatever precautionary measures we might take.

Although deep-well injection ██ █████████ ██████ ███ ██ ███████ ██ ██ █████████ ████ ████ ██████ ██████████ ███ ████████ ███ █████ ███ █████████ █████████

The author’s point is that deep-well injection of wastes is risky. The author doesn’t suggest that this practice can ever be “generally safe.”

Because of the ████ █████ ███ █████████ ███████████ ██████████ ████ █████ ████████ █████████ █████████ ███ ██████ ██████████ ███████████ ███████ ██ ███████████████ █████████

This doesn’t capture the author’s focus on the risk posed by deep-well injection of waste. In addition, the author never suggests that deep-well injection has “wholly supplanted” (completely replaced) other methods of disposing waste.

The increasing use ██ █████████ █████████ ██ █ ██████ ██ ███████████████ ████████ ██ █████████ ████████████

This best captures the main point, which is that disposal of waste through deep-well injection is risky. P2, P3, and P4 are all devoted to describing risks of deep-well injection of hazardous waste.

88%

Careful design and ████████ ██ ███████████████████ ██████████ ██ █████████ ███████ ███████████ ████████ ████ ██ ███████████ ███ █████████

This doesn’t capture the author’s focus on the risk posed by deep-well injection of waste. Although the author would probably agree that design and location of injection sites is important, this is too narrow to capture the overall point of the passage.

PrepTest 158 - Section 1 - Passage 1 - Question 1

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