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Nice passage. Answered all correctly.
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I think this is a poor-quality question and I don't agree with the explanation. The question is wrongly embedded in a RC passage. Please adjust.
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I think "argue" as the tone of this passage is a bit strong...
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Which of the following sentences represents the most logical continuation of Paragraph 2 above?

Hi, how is D not correct simply because it doesn't address the paragraph as a whole? Isn't the whole idea of writing to continue and build on your ideas? Why does continuation depend on addressing the paragraph instead of the last idea mentioned in that paragraph?
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For question 4, why is e not a correct choice? Can someone explain question 4 please?
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I feel the author is not arguing, he is just putting his point.
Option D looks better than option C
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I think this is a poor-quality question and I don't agree with the explanation. "any toxic chemical on the market before 1976 is still at large" is an over-generalization I think. TSCA only touches the regulation side but didn't say anything about customers or manufacturers. Could it be that manufacturers stop using some toxic chemicals due to economical reasons? I just thought the extreme expression here is not supported
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I think this is a poor-quality question and I don't agree with the explanation. toxic chemical on the market before 1976 is still at large in the human population today.

IN HUMAN POPULATION is not correct!
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I think this is a high-quality question and I don't agree with the explanation. Option A should say "most of the chemicals" instead of all
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3. Which of the following can be inferred from the passage about industrial chemicals already on the market when TSCA was enacted?

(a) The ones still available today are unregulated.



HUGE FALLACY, we cannot determine if they are regulated today or not, they might have been regulated and passed the regulation tests. this answer doesn't make any sense...in the question prompt, it says "the industrial chemicals" which includes all the industrial chemicals, the toxic and the nontoxic. the conclusion that the ones which are still in use today are "unregulated" is a completely inaccurate deduction!!!
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I think this is a high-quality question and I don't agree with the explanation. The passage has been clear that TSCA was unsuccessful only because it couldn't touch chemical companies that were profitable. TSCA prioritized profits and not interests of chemical companies . Since it makes it unprofitable for chemical companies to manufacture toxic chemicals , it was unsuccessful . If it made it possible for companies to be profitable even if they banned the companies from manufacturing chemical products , then it definitely would have been successful . If the option D was changed to chemical company profits rather than interests, then it would have been a correct option.
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krishi_22
I think this is a high-quality question and I don't agree with the explanation. The passage has been clear that TSCA was unsuccessful only because it couldn't touch chemical companies that were profitable. TSCA prioritized profits and not interests of chemical companies . Since it makes it unprofitable for chemical companies to manufacture toxic chemicals , it was unsuccessful . If it made it possible for companies to be profitable even if they banned the companies from manufacturing chemical products , then it definitely would have been successful . If the option D was changed to chemical company profits rather than interests, then it would have been a correct option.
­
Thank you for the suggestion! I will implement it. 
P.S. I feel both could options could work but profits is a stronger and more precise choice. I think the answer choices can also be reworded to be more concise, so I will update this word and a few minor tweaks. 
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I don’t quite agree with the solution. When alternative A says "human population today" it seems global population, and not USA population, as I believe it should. What does this part of the sentence actually means? How should I interpret this?
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dfchaves
I don’t quite agree with the solution. When alternative A says "human population today" it seems global population, and not USA population, as I believe it should. What does this part of the sentence actually means? How should I interpret this?

Hi. “Human population” in Choice (A) simply means that these untested chemicals remain in circulation (e.g., in products, in the environment) such that people at large, not just in the United States, could still be exposed today. It’s a broader wording, but it does not invalidate the point that these chemicals were never restricted under TSCA, so they can be anywhere humans live. It is not unusual in discussions of chemical pollutants to speak in terms of the “human population” generally, because these substances often end up crossing borders.
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