单项选择题

A．Availability of artificial body organs.
B．Elimination of genetic defects.
C．Improvements in drags for medical use.
D．An explanation of the origin of life.
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单项选择题
A．He buys a similar thing of the color he wants.B．He usually does not bay anything.C．At least two of his requirements must be met before he buys.D．So long as the style is right, he buys the thing.
A．He buys a similar thing of the color he wants.
B．He usually does not bay anything.
C．At least two of his requirements must be met before he buys.
D．So long as the style is right, he buys the thing.
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