Unit 8 周周清8 Self Check（作业课件）-【四清导航】2022-2023学年九年级英语上册（人教版）河南

四清导航 英语九年级上册人教版 Self Check 一、阅读理解。(10×2.5分=25分) A Boys and girls,do you want to try a scientific test with your parents?Ask them to stand next to you in front of a mirror.What do you see?They might say you have your mom's hair or your dad's ears.But which parent are you most similar to? These similarities and differences all come down to DNA-the basic part of life that carries genes (from our parents.Genes can decide everything from our blood type (and how tall we are to the risk of developing certain diseases.So by knowing your parents'eye color,it is easier to know why your eyes are the color that they are. Scientists have found that some of the DNA we have only comes from one parent.For example,our mitochondria (have DNA that comes only from our mothers, according to Live Science.Some studies suggest that mitochondrial DNA plays a key role in our ability in doing sports."That is a clear example that you're more similar to your mom than your dad,said Marika,a scientist at King's College London. With the exception of mitochondria,it is generally agreed that we get a nearly equal number of genes from both our mothers and our fathers-about 50%from each one.However,which genes actually get expressed? Gene expression refers to(指的是)which genes“switch on”as we develop.According to one study published in Nature,genes got from male (mice get expressed more often than genes got from female mice.However,we have yet to say for sure that this is also true for humans.So for the moment,we can't really say why some of us look more like our mothers or our fathers. D )1.Which of the following is NOT mentioned about things that are decided by genes? A.The blood type.B.The eye color. C.The height. D.The ability to see. B )2.What does the underlined word "That"refer to? A.Mitochondria play a key role in our development. B.We get mitochondrial DNA only from our mothers. C.Mitochondrial DNA has something to do with sports. D.Scientists have found the importance of mitochondria. C )3.Wh