备考干货|SAT阅读每日一练（一）

　　五月SAT考试已经过去，同时六月也快到来，备考时间其实并不长。SAT阅读的题量很大，如果想提高分数，课窝网建议大家需要大量进行练习，并好好总结。今天小编为大家分享一篇SAT阅读素材，希望大家自行检测下哦。

　　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-dimensionalstructureof one such door, or membrane channel, that specializes ingrantingentry 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 arefoundin species ranging from bacteria to humans.

　　GlpF is highly specific for glycerol andsimilarpolyalcohols. 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, incontrast, 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.

　　SAT阅读推荐词汇

　　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阅读题，你做对了吗？做后不要忘记做笔记总结。更多SAT2考试时间、SAT考点等问题，可以咨询我们。