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Tuesday, November 24, 2020

Reading and writing fill in the blanks practice exercise. Below is text with blanks. Choose the correct word for each blank to complete the text.

Creatures that live in dark may lose their sight over evolutionary time. They may even lose their eyes entirely. And it appears that they also lose sleep. Because a new study shows that cave-dwelling fish spend more time awake than their (1) …………………….. at the sunny surface. The finding is in the journal Current Biology.  (2) ………………………… studied three populations of Mexican tetra in the lab. Fish that live in rivers or creeks have two eyes. And those that have adapted to living in caves lack eyes. What they do have is insomnia. The (3) ………………………. observed that the tetras that spend time in the light do sleep soundly at night, resting on the bottom of their tanks. The cavefish, on the other hand, remain on high alert, (4) ………………………. their habitats even after hours. The researchers are working to identify the genes responsible for this fishy (5) ………………………… . Not that they’ll reveal how you can get by on minimal (6) …………………….. . Because the cavefish may not need less sleep—they may need to stay awake to forage more in an environment where food can be scarce and appear (7) ……………………………. .

(1) stops, pars, slots, counterparts
(2) Freelancers, siestas, Researchers, Teacupful
(3) scientists, hypoglycemic, ripeness, obeisance
(4) bowstring, patrolling, frosting, bossing
(5) rigorous, expectorants, conscientiousness, restlessness
(6) gadfly, rabbi, shut-eye, ally
(7) willfully, disparity, individuality, unpredictably

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