PrepTest 124, Section 4, Question 20
Sometimes there is no more effective means of(444 more words not shown)
Which one of the following(9 more words not shown)
- AControl of agricultural(23 more words not shown)
- BExperimental verification is(11 more words not shown)
- CThe relationship between(17 more words not shown)
- DPredation by Typhlodromus(12 more words not shown)
- ESimilarity in mode(20 more words not shown)
Reading the passage
We've already predicted Typhlodromus as an example of effective pest control through predation. I also included the contrast with a pesticide that removes the predator. Now we need the central idea, without turning this example into a rule for every pest.
Working the answers
- A
The opening says “Sometimes.” This answer makes a broad claim about the most effective and safest way to control agricultural pests. One case in which a pesticide makes things worse doesn't establish that general ranking.
- B
The experiments support the biological example. The main point isn't that experimental verification is essential, and the writer doesn't make that requirement.
- CCorrect
This connects the two mites to the broader point: natural predation can control agricultural pests. It doesn't mention the pesticide explicitly, but it captures what the example demonstrates.
- D
The specific mite names and strawberry fields make this sound close. But “essential” says control requires Typhlodromus; we haven't ruled out every other predator or possible method. It also leaves out the role of this relationship as an example of a broader phenomenon. More specific isn't automatically more accurate.
- E
Reproduction helps explain the predator's effectiveness, but this elevates part of the second paragraph into the whole point. It leaves out the broader pest-control lesson and other helpful features, such as surviving when prey is scarce.
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