Some birds like to sit on a sheep because . We learn from the text that corals depend on plants for.

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问题 Some birds like to sit on a sheep because ______.
We learn from the text that corals depend on plants for______.

选项 A、comfort
B、light
C、food
D、oxygen

答案D

解析从文章第二段第四句In their skins there are tiny plants which act as“dustmen”，taking some of the waste products from the corals and giving in return oxygen which the animal needs to breathe．得知。

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Some birds like to sit on a sheep because . We learn from the text that corals depend on plants for.

公共英语二级笔试

公共英语（PETS）

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Mostyoungpeopleenjoyphysicalactivities,walking,cycling,football,ormountaineering.Thesewhohaveapassion【C1】_____

Western-styleconversationsoftendevelopquitedifferentlyfromJapanese-styleconversations.AWestern-styleconversationbetw

Manyteachersbelievethattheresponsibilitiesforlearningliewiththestudent.【C1】______alongreadingassignmentisgiven,

Amongstthemostpopularbookswrittentodayarethosewhichareusuallyclassifiedassciencefiction.Hundredsoftitlesare【C

Severalpassageswerefoundwhenthebookme.

WhenwouldPeterandMaryliketogetmarried?

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BettyandHaroldhavebeenmarriedforyears.Butonethingstillpuzzles(困扰)oldHarold.HowisitthathecanleaveBettyand

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若某离心泵的叶轮转速足够快，且设泵的强度足够大，则理论上泵的吸上高度Hg可达无限大。()

根据我国《民事诉讼法》的规定，民事再审申请书必须在提出。()

“头昏”是指涉及头部的除头痛、头晕以外的任何不适感。()

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(2010年江西.131)由于某化肥厂长期排污，该地域内两个村庄几年来多人患有罕见的严重疾病，根据《环境保护法》的规定，下列哪一选项是错误的?()

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Some birds like to sit on a sheep because . We learn from the text that corals depend on plants for.

Severalpassageswerefoundwhenthebookme.

—Howlongeachotherbeforetheymarried?—Foraboutayear.