A.an official engaged in reformation of pension structures
B.a sociologist devoting himself to the research of social pension structures
C.an economist mastering pension structures in developed countries
D.a politician interested in older people
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A.make efforts to clone the endangered panda
B.save endangered animals from extinction
C.implant embryo into a host animal
D.collect DNA of endangered animals to study
A.host animals
B.funds
C.available panda eggs
D.qualified researchers
A.Kraemer will work with Chinese scientists in clone researches
B.about two thousand species will probably die out in next few decades
C.Kraemer and his team have succeeded in cloning a dog
D.scientists maintain that cloning animals is worth researching
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