50. A. Animal life in a desert environment

51. D larger - lớn hơn

52. A those forms 

No moist- skinned, water-loving animals can exist there. Few large animals are found. The giants of the North American desert are the deer, the coyote, and the bobcat.

53. B. drying

desiccating là hút ẩm

54. D animals are noisy and aggressive

Its population is largely nocturnal, silent, filled with reticence, and ruled by stealth.

So most of them pass the burning hours asleep in cool, humid burrows underneath the ground

55. D dessert sounds

56. C unhealthy 

Its population is largely nocturnal, silent, filled with reticence, and ruled by stealth. Yet they are not emaciated.

Dân số sống về đêm, im lặng, tràn ngập sự trầm lặng, và cai trị bằng sự im ắng. Tuy nhiên, chúng không gầy yếu.

57. D are smaller and fleeter than forest animals

few large animals are found 

it holds more swift-footed, running and leaping creatures than the tangled forest

58. D the forest animals

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