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

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热门试题

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

单项选择题

Which of the following statements is TRUE

A．We can't use different organisms as effectively as our ancestors did.
B．Biotechnology has done harm to the human being since prehistoric times.
C．Biotechnology can be used to modify human health and human environment.
D．Human therapeutic drugs are only dreams of human beings.