单项选择题

What achievements have been got by Collins and Anderson and legions of colleagues

A．They know that human DNA acts like a biological computer program.
B．They have found the basic building blocks of life.
C．They have accomplished some genetic discovery during the past half-century.
D．They are making a breakthrough in DNA.

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单项选择题

One motion is adopted by the Security Council only if ______.

A．14 of 15 members accept this motion
B．all the members have no objection to the motion
C．9 members agree on it and all the permanent members approve of it
D．all the permanent members pass it

单项选择题

What conclusion can we get from the passage

A．Engineering a perfect human is not feasible for the time being.
B．It's impossible for scientists to engineer a perfect tomato.
C．Many diseases will never be conquered by human beings.
D．Doctors will be able to cure all sorts of flaws in DNA in the long run.