单项选择题

What we can do according to para.1

A．We could engineer the development of food crops and domesticated animals through selective breeding practices.
B．We could obtain rapid development.
C．We could change the life form of animal immediately.
D．We could live longer than before.

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单项选择题

It can be inferred from the passage that ______.

A．the future of the genetic engineering is very terrifying
B．the use of the recombinant DNA technology on human beings will be forbidden
C．the recombinant DNA technology brings with it problems our society has previously faced
D．serious dilemmas may be generated when it is used to modify human genetic code