填空题

【参考答案】

reserving→reserved
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for→to
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.
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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