Reading comp PrepTest 131 · Section 4 · Question 4

Passage

Questions 1-8 Passage A  .        Recent studies have shown that sophisticated  . computer models of the oceans and atmosphere Remaining source text redacted.
Passage walkthrough
Passage Summary

Topic: Science


Passage A

Paragraph 1

  • Paragraph note
    • Computer models - Accurate but variable
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • Climate models (oceans/atmospheres)
    • Author - Remarkable accuracy
    • Many variables, wide range of values

Paragraph 2

  • Paragraph note
    • Problem
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • To solve for variables, brute force calculations
    • Example - 5 values, 9 variables = 2m calculations
    • Problem - Current individual computers can’t handle

Paragraph 3

  • Paragraph note
    • Solution - Connected computers; Requirement
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • Private computers stronger, can be connected via internet
    • Solution - Divide calculations up between computers
    • Requirement - Get public interested so they sign up

Passage B

Paragraph 1

  • Paragraph note
    • New discovery
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • Researchers - Many problems in many areas are “parallel”
    • Parallel - Solved by working simultaneously
    • Similar characteristics - Lots of similar elements with simple rules that work together

Paragraph 2

  • Paragraph note
    • Example - Ants
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • Individual ant - Follows simple rules
    • Colony of ants - Complex behavior

Paragraph 3

  • Paragraph note
    • Shift in computer
  • Views, minor Meta-Structures, points of intersection, and the author's attitude
    • Shift - Sequential (one calc at a time) → Parallel (thousands of computers at same time)
    • Problems = Parallel, makes sense to use same type of computer
    • Perform BEST
    • Old - Speed limits

Main Points:

Passage A - Adopting the use of many computers solving problems simultaneously will better allow for the exploration of complex systems such as ocean and atmosphere modes.

Passage B - A paradigm shift in computing is moving us away from sequential computing to parallel computing, which will be best able to tackle the problems that are inherently parallel.

Key Lines?

Passage A:

  • Lines 19-21 - The problem is stated, and the current approach is implied
  • Lines 22-28 - The solution/new approach
  • Lines 30-32 - A requirement for the new approach to work

Passage B:

  • Lines 33-37 - Discovery
  • Lines 37-42 - Common elements of problems
  • Lines 53-56 - The old and new approaches are noted
  • Line 63 - Superlative

Meta-Structure? Relationship Between Passages?

These two passages don’t use exactly the same language, but they both largely overlap in talking about a shift in computing away from sequential/individual computing systems and towards connected/simultaneous ones for solving problems with complex variables that run in parallel. They use different examples, but they both arrive at the same conclusion. As such, these passages largely align and we should take that into account as we tackle the questions.

Old Approach/New Approach (Both) - Both passages, at their core, are about a new approach to computing that can address a set of problems that the old paradigm can’t (see the Problem/Solution discussion below). That old approach is simultaneous or sequential computing, where the necessary calculations are done one-at-a-time, and in order. The new approach is called “simultaneous” or “parallel” computing, and it involves connecting a lot of computers that each run some of those calculations in parallel, allowing for many calculations to be done at once. Both say that this approach is helping to perform complex calculations/solve computing problems. When a passage has an extended Old Approach/New Approach Meta-Structure, the Author’s opinion on the new approach is generally the main point. They both have similar opinions on that new approach, leading to the main points as we stated them above.

Problem/Solution (Both) - This is an offshoot of the Old Approach/New Approach Meta-Structure, where the new approach is an attempt to solve a problem with the old one. The old approach - sequential computing - couldn’t handle the number of calculations necessary to tackle many problems, and so the new approach - parallel/simultaneous computing - was developed to meet the needs of these problems. The solutions here line up with the New Approach from that Meta-Structure, reinforcing our view of the main point while expanding the language that we should look for in the answer choices.

Examples (Passage A) - Passage A brings up a type of “thing” that parallel computing can help to solve - computer models of oceans and the atmosphere, building to large-scale climate trends. This shows up in Paragraph 1, but it isn’t discussed at length after that, so this is a limited Meta-Structure and probably will serve as the basis for just a question or two.

Examples (Passage B) - Passage B uses ants foraging for food as an example of the type of complex system that can form when a bunch of simple elements work together - the characteristics of the problems that are solved well by parallel computing. Note that this isn’t an example of the type of problem that parallel computing can solve, but rather a highly complex system that emerges from simple parts.

Last Thoughts?

While both passages use examples, they use them for different purposes. Passage A brings up some problems that parallel computing can help to solve - running computer models of certain natural systems. Passage B, on the other hand, uses an example to highlight the type of complex system that can emerge from simple interactions, but it’s not necessarily something that a parallel computer would “solve” - it’s not even clear what it would mean to “solve” ant foraging behavior. Let’s keep these different roles in mind for any Argument Structure questions that show up.

Question prompt

The author of passage Remaining source text redacted.
Why the credited answer is right

Credited answer: B

The notes below walk through why it fits the stem and how to eliminate the rest.

Question Type

Science

Strategy Overview

Review the purpose of the paragraph including Lines 30-32, then use that big-picture context and the immediate context of those lines to define the role of the mention of public participation

Answer Anticipation

Lines 30-32 show up in Paragraph 3 - in fact, they close out that paragraph and the passage itself. We said that the purpose of that paragraph was to put forward the Author’s solution/new approach to the noted problems and to identify a requirement of that solution working.Taking a look at the immediate context around that last sentence, we see that it has two parts. The first half talks about successes in implementing the solution - some projects “have already been successful” (Lines 29-30). However, the Author then pivots (“although”) to set up a requirement for this success - the public participation in them (Lines 30-32). So the public participation that this question asks about is a requirement that needs to be met before simultaneous computing can be used to solve problems. Let’s find an answer reflecting that purpose.

Answer choices

  1. A
    encourage public engagement in Remaining source text redacted.
    Why choice A is not credited

    (A) (Lines 29-32) The Author does note that the public has needed to participate in these projects for them to work, and she is in favor of using this method to solve problems. However, she never calls for participation, nor does it seem as if this passage is targeted at the public, so this answer is incorrect.

  2. B
    identify a factor affecting Remaining source text redacted.
    Why choice B matches the stem

    (B) (Lines 29-32) The Author highlights a common element of all successful projects using parallel computing systems over the internet - the public’s interest was sufficiently secured so that they participated in it. This requirement is definitely a factor affecting the feasibility of implementing this solution widely, as the public’s interest might not always be captured by some of these projects, making this the correct answer.

  3. C
    indicate that government support Remaining source text redacted.
    Why choice C is not credited

    (C) (Lines 29-32) The Author doesn’t discuss government involvement. While that may be one way to address a shortfall in public interest in a project, it’s not suggested by the Author, so this answer is out of scope.

  4. D
    demonstrate that adequate support Remaining source text redacted.
    Why choice D is not credited

    (D) (Lines 29-32) This can be a tempting answer. However, the Author notes only that “[s]ome” projects have succeeded, which doesn’t guarantee there’s enough support for all projects to succeed. Additionally, she pivots away from this statement of success (“although”), and the implication of pivoting away from an idea is that that idea isn’t your main contention. Since the Author pivots from success to discussing public interest in a project, she must be discussing that public interest for a reason other than highlighting that success.

  5. E
    suggest that a computing Remaining source text redacted.
    Why choice E is not credited

    (E) (Lines 29-30) The Author starts the sentence by stating that the computer model has already worked, so it’s too extreme to say that the Author believes it’s “infeasible.”

What this tests

Question analytics

Based on historical answer selection rates for this question.

Answer choice distribution

  1. A 8%
  2. B Credited 81%
  3. C 3%
  4. D 7%
  5. E 2%

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