网站导航     在线客服  
小站教育
sat新手资料大合集【打包下载】
学生选择在小站备考:30天 566124名,今日申请5人    备考咨询 >>

2018年4月29日SAT阅读每日一练 备战5月SAT

2018年04月28日16:44 来源:小站整理
参与(0) 阅读(1334)

SAT/ACT备考资料免费领取

免费领取
摘要:小站与你一起备战5月SAT考试。由SAT考试官方出品(SAT daily practice),每天一道权威SAT阅读练习题,在苦刷SAT真题之余,是保持备考状态并适当放松身心的绝佳调剂资料。众SATer可善用,本文为2018年4月29日SAT阅读每日一练,考察语篇阅读中的词义理解。

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。

2018年4月29日SAT阅读每日一练  备战5月SAT图1

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,请持续关注小站SAT频道。祝2018年与SAT一战即高分。

特别申明:本文内容来源网络,版权归原作者所有,如有侵权请立即与我们联系contactus@zhan.com,我们将及时处理。

相关文章

SAT阅读如何提速?4个技巧大揭秘 如何扩大阅读量?2个方法需掌握 【SAT阅读能力提升】SAT阅读中的文学术语大汇总 【SAT阅读能力提升】SAT阅读备考中的熟词僻义 新SAT阅读备考技巧之能力与速度的提升 你掉进这些阅读陷阱了吗?SAT阅读词汇学习的常见误区 3个小妙招解决SAT阅读生词关 SAT阅读取得高分的4大障碍

专题推荐

未输入验证码
未输入验证码
未输入验证码
获取验证码
免费领取
版权申明| 隐私保护| 意见反馈| 联系我们| 关于我们| 网站地图| 最新资讯
© 2011-2018 ZHAN.com All Rights Reserved. 沪ICP备15003744号-3
沪公网安备 31010602002658号