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It’s a good thing that sloths (树懒) don’t...

    It’s a good thing that sloths (树懒) don’t have to go to school. They’d never make it on time. These sleepy tree-inhabitants sleep up to 20 hours a day! And even when they are awake, they barely move at all. In fact, they re very slow, and algae (海藻) actually grows on their fur.

Sloths live in the tropical forests of Central and South America, With their long arms and hairy fur. they look like monkeys, but they are actually related to anteaters (食蚁兽). They can be 2 to 2.5 feet long and weigh from 8 to 17 pounds, depending on species.

There are two main species of sloth, identified by whether they have two or three claws. (爪子) on their front feet. The two species are quite similar in appearance, with roundish heads, sad-looking eyes, tiny ears, and short tails. Two toed sloths are slightly bigger and tend to spend more time hanging upside down than their three toed cousins, who will often sit upright in the fork of a tree branch. Three toed sloths have facial coloring that makes them look like they’ re always smiling. They also have two extra neck vertebrae that allow them to turn their heads almost all the way around!

Some scientists think sloths developed their slow-motion lifestyle so they would be less noticeable to hunters such as hawks and cats, which rely heavily on their eyesight when hunting. The algae that grows on sloths’ fur also helps them avoid hunters by letting them mix in with green leaves. They rarely come down from the trees. About once every week, they go down to go to the bathroom, slowly moving about by digging their front claws into the dirt and dragging their bodies. If they are caught by a hunter, sloths will become aggressive, biting fiercely, striking with their claws, and screaming.

1.Who belongs to the same race as the sloth?

A.The monkey.

B.The anteater.

C.The hawk.

D.The cat.

2.Sloths are classified mainly by________.

A.their arms

B.their heads

C.their claws on their front feet

D.their fur on their bodies

3.According to the text, sloths go down from trees once every week in order to________.

A.clean their bodies.

B.hunt food

C.avoid being hunted

D.search for habitats

4.What can we learn from the text?

A.Sloths always like smiling.

B.Cats dislike hunting sloths.

C.Sloths can sleep for a long time.

D.Sloths keep clam when facing danger.

 

1.B 2.C 3.A 4.C 【解析】 这是一篇说明文。文章介绍树獭的生活习性。 1.细节理解题。根据第二段中Sloths live in the tropical forests of Central and South America, With their long arms and hairy fur. they look like monkeys, but they are actually related to anteaters (食蚁兽).(树獭生活在中美洲和南美洲的热带森林里,长着长长的胳膊和毛茸茸的皮毛。它们看起来像猴子,但它们实际上是食蚁兽的亲戚。)可知,食蚁兽和树懒属于同一种族。故选B。 2.细节理解题。根据第三段第一句There are two main species of sloth, identified by whether they have two or three claws. (爪子) on their front feet.“有两种主要的树懒,它们的特征是前脚上有两个或三个爪子。”故选C。 3.推理判断题。根据最后一段中They rarely come down from the trees. About once every week, they go down to go to the bathroom, slowly moving about by digging their front claws into the dirt and dragging their bodies.“他们很少从树上下来。大约每个星期,它们都会下楼去一次洗手间,用前爪在泥土里刨来刨去,然后拖着身体慢慢移动。”可知,树懒每周从树上下来一次是为了清洁身体。故选A。 4.推理判断题。根据第一段中These sleepy tree-inhabitants sleep up to 20 hours a day! And even when they are awake, they barely move at all.“这些昏昏欲睡的树居民每天睡20个小时!即使在他们醒着的时候,他们也几乎不动。”可知,树懒可以睡很长时间。故选C。
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