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Unformatted text preview: robably helps them slip through the water." This is a specific example of one adaptation that these fish have made to increase their swimming efficiency. None of the other choices is mentioned in the paragraph.
6. ○ 1 This is a Factual Information question asking for specific information that can be found in the passage. The correct answer is choice 1, "They lack a swim bladder." Paragraph 6 explicitly states ". . . tunas must swim to breathe. They must also keep swimming to keep from sinking, since most hale largely or completely lost the swim bladder . . ." The other choices are not supported by the passage. 7. ○ 4 This is a Sentence Simplification question. As with all of these items, a single sentence in the passage is highlighted:
One potential problem is that opening the mouth to breathe detracts from the
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streamlining of these fishes and tends to slow them down.
The correct answer is choice 4. That choice contains all of the essential ideas in the highlighted sentence. It is also the only choice that does not change the meaning of the sentence. It omits the fact that this is "a problem” and also "that it detracts from streamlining" because that information is not essential to the meaning.
Choice 1 says that these fish have trouble opening their mouths while swimming, which is not true. Choice 2, that streamlining prevents fish from slowing down, may be true, but it is not mentioned in this sentence. The fish are slowed down when they open their mouths, which reduces streamlining. Choice 3, that streamlining slows the fishes' breathing, is also not mentioned.
8. ○ 3 This is a Vocabulary question. The word being tested is channel. It is highlighted in the passage. The correct answer is choice 3, "direct." Channel here is used as a verb, meaning to "move" or "push."
9. ○ 2 This is a Factual Information question asking for specific information that can be found in the passage. The correct answer is choice 2, "make efficient use of water currents." Paragraph 8 explicitly states: "Perhaps most important of all to these and other fast swimmers is their ability to sense and make use of swirls and eddies (circular currents) in the water. They can glide past eddies that would slow them down and then gain extra thrust by "pushing off" the eddies. Scientists and engineers are beginning to study this ability of fishes in the hope of designing more efficient propulsion systems for ships." The other choices are not mentioned in connection with the performance of ships.
10. ○3 This is a Factual Information question asking for specific information that can be found in paragraph 9. The correct answer is choice 3, "They can swim in waters that are much colder than their own bodies." That paragraph says, "A bluefin tuna in water of 7°C (45°F) can maintain a core temperature of over 25°C (77"F)." So it is clear that choice C is correct. Choice 1 is not stated in the paragraph. Choice...
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- Fall '13