Unit1 Section Ⅱ Grammar and usage & Integrated skills（作业）-2022-2023学年新教材高中英语选择性必修第四册【精讲精练】牛津译林版

[课时作业] Ⅰ.阅读理解 New research suggests that a gene that governs the body's biological (circadian) clock acts differently in males versus females and may protect females from heart disease.The study is the first to analyze circadian blood pressure rhythms(节奏) in female mice. The body's circadian clock－the biological clock that organizes bodily activities over a 24­hour period－contributes to normal variations in blood pressure and heart function over the course of the day.In most healthy humans, blood pressure dips(下降)at night.People who do not experience this temporary drop, called “non­dippers”， are more likely to develop heart disease.The circadian clock is made up of four main proteins(encoded by “clock genes”)that regulate close to half of all genes in the body, including those important for blood pressure regulation. Previous research has shown that male mice that are missing one of the four clock genes(PER1)become non­dippers and have a higher risk for heart and kidney disease.A research team studied the circadian response and blood pressure of female mice that lack PER1 and compared them with a healthy female control group.On both low—and high­salt diets, both groups “　retained　 an apparent circadian rhythm” of blood pressure, the researchers explained.Unlike the male mice in previous research, the females without PER1 showed normal dips in blood pressure overnight. These results suggest that the lack of PER1 acts differently in males and females.The findings are consistent with research showing that women are less likely to be non­dippers than men of the same age.“This study represents an important step in understanding sex differences in the regulation of cardiovascular(心血管) function by the circadian clock，” the researchers wrote. [语篇解读]　这是一篇说明文。主要介绍了控制人体生物钟的基因在男性和女性中的作用不同，女性可能受益于生物钟。 1. What does the new research find? A. Biological clock may protect males from heart disease. B．Biological blood pressure rhythms in female mice acts normally. C．Biological cloc