A.procedure B.transplant C.attempt D.native ...
问题详情:
A. procedure B. transplant C. attempt D. native E. extinct F. prohibited
G. worth H. appreciate I. reintroduce J. undertaken K. groundbreaking
With only about 1,000 pandas left in the world, China is desperately trying to clone the animal and save the endangered species. That’s a move similar to what a Texas A&M University researchers have 41 for the past five years in a project called “Noah’s Ark.”
Noah’s Ark is aimed at collecting eggs, embryos (胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become 42 , Dr. Duane Kraemer, a professor in Texas A&M’s College of Veterinary Medicine, says there would be enough of the basic building blocks to 43 the species in the future.
It is estimated that as many as 2,000 species of mammals, birds, reptiles will face extinction in over 100 years. The panda, 44 only to China, is in danger of extinction in the next 25 years.
This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to 45 the embryo into a host animal.
The entire 46 could take from three to five years to complete.
“The nuclear transfer of one species to another is not easy, and the lack of available panda eggs could be a major problem,” Kraemer believes. “They will probably have to do several hundred transfers to result in one pregnancy (怀孕). It takes a long time and it’s difficult, but this could be
47 science if it works. They are certainly not putting any live pandas at risk, so it is
48 the effort,” adds Kraemer, who is one of the leaders of the project at Texas A&M, the first-ever 49 at cloning a dog.
“They are trying to do something that’s never been done, and this is very similar to our work in Noah’s Ark. We’re both trying to save animals that face extinction. I certainly 50 their effort and there’s a lot we can learn from what they are attempting to do. It’s a research that is very much needed.”
【回答】
J E I D B A K G C H
知识点:信息匹配
题型:阅读填空
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在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 ...
问题详情:在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 C.光照 D.土壤【回答】C知识点:生物圈是最大的生态系统题型:选择题...
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下列反应的离子方程式正确的是( )A.在碳**镁溶液中加入足量Ca(OH)2溶液:Mg2++2HCO3-+C...
问题详情:下列反应的离子方程式正确的是( )A.在碳**镁溶液中加入足量Ca(OH)2溶液:Mg2++2HCO3-+Ca2++2OH-=MgCO3↓+CaCO3↓+2H2OB.电解饱和食盐水:C.过量的铁与浓**反应: Fe+6H++3NO3-=Fe3+十3NO2↑+3H2OD.向硫*铝铵[NH4Al(SO4)2]溶液中滴加足量Ba(OH)2溶液 NH4++Al...
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在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降...
问题详情:在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降为1.8mol,则前20s的平均反应速度为()A.v(B)=0.03mol/(L•s)B.v(B)=0.045mol/(L•s)C.v(C)=0.03mol/(L•s)D.v(C)=0.06mol/(L•s)【回答】考点:化学反应速率和化学计量数的关系.专题:化学反应速率专...
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光明在低头的一瞬 ...
问题详情: 光明在低头的一瞬 迟子建 ...
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