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一、题文
When Gregor Mendel was teaching high school students,he noticed that plants had different traits (特征).For example,some pea plants were tall,(66)w ______ others were short.Mendel wondered why,so he decided to experiment. He (67)c ______ the seeds (种子) that were produced.He planted these new seeds and waited for the(68)r ______ .He wondered whether the new plants would be of medium (69)h ______ .But all the plants that grew from the seeds were tall. Mendel wanted to see what would (70)h ______ to the next generation (一代).He crossed the tall plants with each other in the same way he had experimented with the tall and short plants.When the (71)n ______ plants grew,three fourths of the plants were tall,and one fourth were short. Mendel found out that a plant (72)r ______ a message from each of its parents,and that message is carried by the plant"s genes (基因).For example,a pea plant gets a gene for tallness or shortness from one or both of its parents.Mendel (73)a ______ found out that some genes were stronger than others.The gene for tallness was stronger than the gene for shortness.So a plant would be (74)t ______ if it had one gene for tallness and one gene for shortness.But if a plant had two genes for shortness,it would be short. Mendel had made a great (75)d ______ ,but few understood it at that time.Mendel became famous only after his death.
二、解答
【小题1】hile 【小题2】ollected 【小题3】esult(s) 【小题4】eight 【小题5】appen 【小题6】ew 【小题7】eceives 【小题8】lso 【小题9】all 【小题10】iscovery三、分析
66.while.根据文中可知格里戈尔•孟德尔发现一些豌豆植物高,然而另一些低,句子前后是转折关系,且首字母是w,故填写while,表示然而. 67.collected.划线处缺一个动词作谓语,根据文中可知孟德尔要做实验,所以他收集了种子,且所给字母是c,本句描述的是过去发生的事情,故填写collected,表示收集. 68.result(s).划线处缺一个名词作宾语,根据文中可知孟德尔种植了种子,等待结果,且首字母是r,故填写result(s),单复数都可,表示结果. 69.height.划线处缺一个名词,根据文中可知孟德尔种植这些种子的原因是因为他想知道这些植物是否都是中等高度,且首字母是h,故填写height,表示高度. 70.happen.划线处缺一个动词作谓语,根据文中可知孟德尔想知道下一代将会发生什么,would后是动词原形,且首字母是h,故填写happen,表示发生. 71.new.划线处缺一个形容词作定语,根据文中可知孟德尔种植的新植物长大了,且首字母是n,故填写new,表示新的. 72.receives.划线处缺一个动词作谓语,根据文中可知孟德尔发现植物可以从它每一个父母那里接受信息,且首字母是r,本句描述的是一般事实,主语是第三人称单数,故填写recieves,表示接收.recieve…from表示从…接受. 73.also.划线处缺一个副词,根据文中可知孟德尔也发现了一些基因要比其他一些更强大,且首字母是a,故填写also,表示也. 74.tall.划线处缺一个形容词作表语,根据文中可知高植物的基因比低植物基因更强大一些,如果这个植物有一个高的基因和一个低的基因,那么这个植物会很高,且首字母是t,故填写tall,表示高. 75.discovery.划线处缺一个名词,根据文中可知孟德尔做出了一个重大发现,且首字母是d,故填写discovery,表示发现. 当格里戈尔•孟德尔在中学教书时,他注意到植物有不同特征.比如,一些豌豆植物高,然而另一些低.孟德尔想知道这是为什么,所以他决定做实验.他收集了生产的种子.他种植了这些新的种子,等待结果.他想知道这些植物是否都是中等高度.但是长出的所有植物都很高.孟德尔又想知道下一代会发生什么.他用种植高低植物实验的同样方式,把高的植物相互交叉种植在一起.当新的植物生长出来时,3/4的植物都是高的,1/4是低的.孟德尔发现植物可以从它的每一个父母那里接收到信息,这个信息被植物基因所携带.比如,豌豆植物从一个或者父母那里可以得到高的或者低的基因.他还发现一些基因比其他一些要更强大.高的植物基因比短的植物基因更强大些,所以如果一个植物有一个高的基因,又有一个低的基因,那么这个植物会高.但是如果一个植物有2个基因,它就会低.孟德尔做出了一个重大发现,但是那时候很少有人理解它.孟德尔在他去世后才出名. 本文给出首字母,考查单词填空,有一定难度,要求学生需认真阅读文章,理解大意,根据上下文语境进行单词填写,注意时态及单复数等细节问题.此类题要求学生要有扎实的词汇语法基础.本文到此结束,希望对大家有所帮助。
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