单项选择题X 纠错
A．the state should provide the majority of pensions
B．the state should provide more protection against old-age poverty
C．the role that the state plays in pensions is small
D．private funding should provide the majority of pensions
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单项选择题
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
单项选择题
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
单项选择题
A．host animals
B．funds
C．available panda eggs
D．qualified researchers
单项选择题
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
