人教版英语精品资料（精修版）活页作业(四).阅读理解The United States government wants to know what the public thinks about its findings on the safety of cloned animals.The Food and Drug Administration says meat and milk from clones of adult cattle，pigs and goats are safe to eat.An FD.A.official called them“as safe to eat as the food we eat every day”And when those clones reproduce sexually(有性繁殖)，the agency says，their offspring(后代)are safe to eat as well.But research on cloned sheep is limited.So the FD.A.proposes that sheep clones not be used for human food. The United States this year could become the first country to approve the sale of foods from cloned animals.First，however，the public will have ninety days to comment on three proposed documents.On December 28th the FD.A.released a long report，called a draft risk assessment，along with two policy documents.The agency says it must receive comments by April second.The FD.A.seemed ready to act several years ago，but an advisory committee called for more research.For now，the government will continue to ask producers to honour a request that they not sell foods from cloned animals.Clones are still rare.They cost a lot and are difficult to produce.The FD.A.says most food from cloning is expected to come not from clones themselves，but from their sexually reproduced offspring.It says clones are expected to be used mostly as breeding animals to spread good qualities.Public opinion studies show most Americans do not like the idea of food from cloned animals.But this research also shows the public know little about cloning.Cloning differs from genetic engineering.A cell taken from a socalled donor animal is grown into an embryo(胚胎)in the laboratory.Next，the embryo is placed into the uterus(子宫)of a female animal.If the process is successful，the pregnancy reaches full term and a genetic copy of the donor animal is born.1From the passage we know that _.Afoods from cloned animals are popular in AmericaBcloned adult animals are safe to eat except sheepCcloned animals will be easy to produceDmost food from cloning is expected to take the place of other food解析：由第二段可知，克隆羊目前还没有证实其安全性，不能作为人类的食物，但其他克隆动物是可以安全食用的。答案：B2The main purpose of the passage is to _.Atell an interesting storyBgive some advice on foodsCgive a reportDcompare different opinions解析：本篇文章是关于克隆食物的安全问题的报道。答案：C3Who believes that foods from cloning are safe to eat?AMost Americans.BAn advisory committee.CCritics. DThe FD.A.解析：由第二段首句可知，F.D.A.相信克隆食物是可以安全食用的。答案：D4It can be inferred from the last paragraph that _.Acloning has much in common with genetic engineeringBnot every cell taken from a donor animal can grow into a genetic copyCthe donor animal should be a female oneDcloned animals grow faster than normal ones解析：由最后一段可知，动物细胞在符合一定的条件时才能成功克隆出动物来，也就是说，不是所有细胞都能成长为跟母体同样的动物体。答案：B.七选五填空Learning English online is an effective way to improve your English.But with any type of learning you need to be prepared.This passage will give you advice and tips on how to get the most out of your online lessons.1_This is an obvious point but also the most important one.A computer，a good Internet connection and a headset are what you will need to take classes online.A web camera is also pretty important.Make sure that your computer is turned on，that everything is plugged in correctly and that you have tested the connection.Doing this before the class means that you will be ready when the lesson starts.Take the classes somewhere quiet.2_Trying to listen and participate(参与)in English classes is very difficult when there is noise around you.So find a quiet room and make sure that no one disturbs you while you are taking your lesson.3_When grammar or anything else is being taught，make sure that you understand it.You wont need to practice it at this time；just make sure that everything is clear.If you dont understand what is being taught，ask your teacher to explain it again.Your teacher will be more than happy to deal with whatever puzzles you.Practice speaking English.Every class is an opportunity to practice your English speaking with a native and qualified teacher.Try to allow the conversation to flow by listening and talking in a natural way.4_ The teacher should note the mistakes and correct them at a later time.Relax.Come to class feeling relaxed and excited.5_Come into the class excited about learning English.You will be able to get more out of the class this way.AReview after the lesson.BMake sure everything is ready.CUnderstand what is being taught.DGet away from everything that may be going on in your home.ELanguage learning should be enjoyable especially in online classes.FYou will meet many problems when you are learning English online.GThis is your chance to speak English without worrying about too many mistakes.答案：15BDCGE.完形填空(2017全国卷)While high sch