2018年4月29日SAT阅读每日一练 备战5月SAT

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为广大SATer带来2018年4月29日的SAT阅读每日一练，考察语篇阅读中的词义理解，大家可以先直接针对选项做推测练习，之后再有针对性在文章出题做快速阅读，再做推断，最后精读全文，积累文末列举的词汇。一题三用，岂不妙哉。

4月29日SAT阅读每日一练

Like an opera house, which has its public entrance separate from that for the

performers, a cell has different doors for different molecules. Each gets

scrutinized at its door before it can enter the cell. Now researchers from the

University of California at San Francisco have revealed in the journal Science

the three-dimensional structure of one such door, or membrane channel, that

specializes in granting entry to a membrane component known as glycerol.

Specifically the channel is called the glycerol facilitator (GlpF), from the

bacterium Escherichia coli.

Bearing three alcohol groups, glycerol is a basic building block for the cell

membrane. (Other components include fatty acids and small charged molecules.)

And not just in E. coli. Indeed, although the channel the researchers studied is

from a bacterium, it belongs to a large protein family dubbed the aquaporins,

which are found in species ranging from bacteria to humans.

GlpF is highly specific for glycerol and similar polyalcohols. Somehow, even

though water molecules are much smaller, they cannot enter. The new study

reveals why. In order for glycerol to clear the four-channel configuration in

the cell membrane, it must pass through a narrow selectivity filter in the

center of a channel. Here it is surrounded by amino acids that closely match its

own structure, which is hydrophilic ("water-loving") on one side and hydrophobic

("water-fearing") on the other. Water molecules, in contrast, can only pass

through this area in single file, which is not energetically favorable, because

they like to bond to one another. And ions, which are charged, are unable to

pass the "water-fearing" side of the channel. This cell entrance, it seems, is

truly exclusive.

The underlined word "granting" most nearly means __________

与granting意思最接近的单词是

A. consenting.

B. fulfilling.

C. permitting.

D. transferring.

答案：C

解析：

Choice C is the best answer. The context makes it clear that when the author

says the membrane channel specializes in "granting entry to a membrane

component," she means that the membrane channel's job is to permit entry to the

membrane component, or to allow the membrane component to move into the

cell.

4月29日SAT阅读每日一练推荐词汇

context['kɔntekst]n. 上下文，环境，背景

alcohol['ælkəhɔl]n. 酒精，乙醇，酒

species['spi:ʃiz]n. (单复同)物种，种类

component[kəm'pəunənt]n. 元件，组件，成份 adj. 组成的

membrane['membrein]n. 薄膜，膜皮，羊皮纸联想记忆

exclusive[iks'klu:siv]adj. 独占的，唯一的，排外的

bacterium[bæk'tiəriəm]n. 细菌 bacteria[bæk'tiəriə]n. (复数)细菌

selectivity[silek'tiviti]n. 选择性;分离性;选择度联想记忆

favorable['feivərəbl]adj. 有利的，赞许的，良好的，顺利的，偏袒的

以上就是小编为大家带来的《2018年4月29日SAT阅读每日一练

备战5月SAT》的全部内容。放松心情，将SAT考试看成是出境游顺便进行的一次考试，不亦乐乎。更多SAT备考知识与技巧攻略，请持续关注易伯华SAT频道。祝2018年与SAT一战即高分。