SAT官方阅读每日一练 18年5月22日

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为广大SATer带来2018年5月22日的SAT阅读每日一练，考察篇章层面的结构题，需要通读全文并理解作者行文架构，难度较大。配有答案，解析，众考生，慢慢操练吧。文末附2018SAT阅读题型清单。

SAT阅读每日一练

Plants, and all other living things, require nitrogen for growth; it is an

essential component of nucleic acids and proteins. Although air is mostly

nitrogen, this gaseous form is inaccessible to plants and must be fixed into

ammonium to render it biologically relevant. Soil bacteria called rhizobia fix

nitrogen, but to do this they must first take up residence inside the roots of

legumes like pea, alfalfa, clover, and soybean.

Soon after a legume begins to grow, rhizobia invade its root hairs and

multiply, causing the plant to form specialized organs—nodules—that contain the

proliferating bacteria. This symbiotic arrangement benefits both parties:

legumes can thrive without nitrogen fertilizers only if they have functional

nitrogen-fixing nodules, while the bacteria receive the energy needed to

multiply and fix nitrogen from the plant. When the plant dies, the fixed

nitrogen is released into the soil so other plants can use it. This process has

significant implications for agriculture, as nitrogen is the most common

nutrient deficient in the earth’s soil and, thus, the one most commonly supplied

by chemical fertilizers.

Rhizobia are a diverse group taxonomically, genetically, and metabolically.

They can be found in distant genera. Their symbiotic trait appears to have

arisen independently multiple times by horizontal transfer of genes. However, it

is not thought that this horizontal gene transfer is sufficient to confer

symbiosis, or to explain the biodiversity of rhizobia. There must be selective

pressures preventing or permitting the expression of the acquired symbiosis

trait and adaptive mechanisms to deal with these pressures. But neither the

pressures nor the measures taken to circumvent them are known.

The underlined word "relevant" most nearly means ____

A.connected.

B.linked.

C.useable.

D.pertinent.

答案：C

解析：

Choice C is the best answer. The author states that the gaseous form of

nitrogen "is inaccessible to plants and must be fixed into ammonium to render it

biologically relevant." In this context, "relevant" most nearly means "useable."

The author's point is that the nitrogen must be in a form that is biologically

useable or accessible to plants.

SAT阅读相关词汇

multiple['mʌltipl]adj. 许多，多种多样的 n. 倍数，并联confer[kən'fə:]vi. 商讨 vt.

赠予，授予联想记忆

specialized['speʃəlaizd]专门的 专科的 accessible[æk'sesəbl]adj. 可得到的，易接近的，可进入的

functional['fʌŋkʃənəl]adj. 功能的，有功能的，实用的 residence['rezidəns]n. 住处，住宅，

circumvent[.sə:kəm'vent]vt. 围住，绕行，用计谋应付 essential[i'senʃəl]n. 要素，要点adj.

必要的，重要的

pertinent['pə:tinənt]adj. 相关的，中肯的，切题的 selective[si'lektiv]adj. 选择的，选择性的

2018年SAT阅读题型清单

对文本信息的考察，包括1文本细节的考查 2文本论据的考查 3文本传达信息的考查

对作者写作技能的考察，包括1.单词/词组/句子功能题2.文本结构题3.观点态度题4.目的题 5.论证题

综合题，包括1.双篇题2.图表题

从词汇层面看，词汇题考察的是词汇的意思和功能;

从段落层面看，考察的题目包括观点态度题，目的题，小结题，中心思想题，论证题，细节类题型等等;

从篇章层面看，同样包括细节题，态度，目的，小结，中心思想题，论证题，还包括关系题，循证题，文本结构题等。

以上就是小编为大家带来的《SAT官方阅读每日一练

18年5月22日》的全部内容。左手SAT真题OG，右手易伯华SAT备考干货，祝2018年与SAT一战即高分。