课件49张PPT。CloningUnit 2 Scientists have used cloning technology to transform human skin cells into embryonic stem cells, an experiment that may revive the controversy over human cloning. Since the birth of Dolly the sheep in 1996, researchers have cloned about 20 different species, including rabbits, goats, cows and cats. Yet they so far have been unable to create biologically identical copies of any monkey or primate, including humans, possibly because their reproductive biology is more complicated. “But the refinements(改良品) described in the latest experiment suggest that it's a matter of time before they produce a cloned monkey,” said Jose Cibelli, a cloning expert at Michigan State University, who wasn't involved in the study. It also means, he added, “that they are one step closer to where the efficiency is high enough that someone is willing to try to clone a person, though that remains a distant and disturbing prospect.” The researchers weren't simply trying to reach a cloning milestone. Instead, they were looking for a better way to make fresh human tissue for the treatment of severe injuries or disease. Lab|grown tissue has the potential to transform medicine, though it is still a long way from routine clinical use. For example, fresh nerve cells could alleviate spinal cord injuries, or newly?made heart cells could repair a site scarred by a heart attack.Section Ⅰ Warming Up and Reading 栏目导航Ⅰ.Read the text and match the main idea with each paragraph. Para 1:（ ） A.Dolly's problem and death. Para 2:（ ） B.What is cloning? Para 3:（ ） C.Two major uses of cloning. Para 4:（ ） D.Arguments brought by Dolly. Para 5:（ ） E.The effect of Dolly.B CAED Ⅱ.Scan the text and choose the best answer according to the text. 1.The main idea of the text is. A.animal cloning is very valuable and can benefit the world B.animal cloning could be misused by bad people so it must be forbidden C.animal cloning is well developed because Dolly the sheep was born D.animal cloning raised arguments and scientists are not sure about its future 答案：D2.The lamb is the clone of the cell from sheep because . A.it provides the egg cell B.it gives birth to the lamb C.it provides the nucleus D.it is a female sheep 答案：C 3.It can be learnt from the passage that a cloned animal. A.usually lives as long as the original one B.usually lives longer than the original one C.usually dies earlier than the original one D.is usually as healthy as the original one 答案：C4.Which of the following is NOT a problem or danger of cloning mentioned in the text? A.Evil leaders may want to clone themselves. B.Animal clones may develop the illness of older animals and may die younger than the donor animals. C.There are moral objections to cloning human beings. D.Too much cloning may lead to the destruction of the balance of nature. 答案：D5.What about the writer's attitude toward cloning in this passage? A.The writer is against cloning. B.The writer is in favor of cloning ... ...
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