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课后限时自测(三十)Ⅰ.语法times.Perhaps it makes __1__ feel more content with our life because we feel there is someone else __2__(bad) off than ourselves.__3__，some actors can astonish us with the deep feelings.Charlie Chaplin，the most famous actor __4__ the period of silent films，was such an actor.He was able to __5__(make) terrible situations funny and at the same time show the humanity and kindness that can be found in the most difficult circumstances.Take The film __6__(set) in California in the middle of the nineteenth century.Chaplin and his friend wash sand from the river in a pan of water.__7__ they expect eagerly to find gold，they have not been __8__(fortune) enough to find any.Instead，they are caught in a snowstorm in a small wooden house，__9__(have) nothing to eat.They are so hungry __10__ they have to boil a pair of leather shoes and eat it.Chaplin seems to eat every mouthful with great enjoyment and makes it seem to be one of the best meals he has ever had! 1．us 根据后面的our life和we可知，此处应用us，作makes的宾语。 根据后面的than可知应用比较级形式。 下文与前面是转折关系，故用however“然而”。注意首字母应大写。另外，此处不能用but，因为后面有逗号。ing 表示“在……期间”用介词during。 be able to后接动词原形，be able to do sth.“能够做某事”。 be set in意为“以……为背景”，本文通篇用现在时is set。 句意：尽管他们迫切希望找到金子，但是……，前后句之间为让步关系，故用although/though“尽管，虽然”引导状语从句。 此处所填词在句中作表语，故用形容词形式。 have与句子主语they为主动关系，且have表示的动作与谓语动词表示的动作同时发生，故用现在分词作状语。 此处考查“so＋形容词＋that...”结构。阅读理解ersity(MSU) researchers has developed a new，more efficient way of cloning zebra fish，a breakthrough that could have an impact on research into human health.，they are the most commonly used vertebrates，that is，animals with backbones，in genetic studies，”says Jose Cibelli，the leader of the team.“They are used in cancer and heart－disease research because they have many of the same genes as people have.”，zebra fish have also served as an excellent model for understanding both normal development and birth imperfections.More recently，research with zebra fish has extended to modeling human diseases.(捐赠者) cell.The DNA is removed from the egg and replaced by the DNA taken from the donor.The resulting fish is an exact genetic copy of the donor.In Cibelli's technique，the egg is removed from the female zebra fish and placed in the ovarian(卵巢的) fluid of a Chinook salmon，another kind of fish，before the donor cell is placed into the egg.The previous methods of cloning zebra fish had very low survival rates.With the new technique，the number of cloned fish is increased by 15 percent. is that their eggs are transparent(透明的)，making the fish's development easy to follow.－fish cloning techniques is also important because currently the mouse is the only good model for genetic research.rom which you can delete genes in a reliable way，”Cibelli says.“What researchers do is mutate(使变异) a gene，destroy its function completely，and then study the consequences.”be used to cure human diseases. | 
