单项选择题

A．spotless
B．pointed
C．wounded
D．completed
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单项选择题
Biotechnology enables us ______.
A．to change the DNA of human beings
B．to produce more milk by increasing the number of cows
C．to increase the functions of various cells and organisms
D．to find new human molecules
单项选择题
The human beings began to use biotechnology ______.
A．when they could walk on their feet
B．before they could plant their own crops
C．after they realized that they could raise their own animals
D．as soon as scientists began their studies on biotechnology
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