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Practice Reading: Multiple Choice, Multiple Answers ID: #33394 Engineering of Fish
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Read the text and answer the question by selecting all the correct responses. You will need to select more than one response.
There are adaptations that increase the amount of forward thrust as well as those that reduce drag. Again, these fishes are the envy of engineers. Their high, narrow tails with swept-back tips are almost perfectly adapted to provide propulsion with the least possible effort. 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.

According to the passage, one of the adaptations of fast-swimming fishes that might be used to improve the performance of ships is these fishes' ability to

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Option 2: "make efficient use of water currents"

Explanation: This option is correct as the text highlights the fishes' ability to sense and utilize swirls and eddies in the water, which indicates their efficiency in using water currents for propulsion.

Option 1: "swim directly through eddies"

Explanation: The text does not mention that fast-swimming fishes swim directly through eddies. Instead, it states that they glide past eddies to avoid slowing down, which contradicts this option.

Option 3: "cover great distances without stopping"

Explanation: The text does not provide information about the fishes' ability to cover great distances without stopping. It focuses on their adaptations for propulsion and efficiency, making this option irrelevant.

Option 4: "gain speed by pushing off the swirls"

Explanation: This option is correct because the text explicitly states that fast-swimming fishes can gain extra thrust by 'pushing off' the eddies, which directly supports this adaptation.

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