赞题库-背景图

单项选择题

What we could do in order to change the characteristics of plants and animals

A．We could alter the DNA genetic code.
B．We could select new breeding practices.
C．We could build new life forms.
D．We could add chemicals.

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热门试题

单项选择题The word alleviate'(Para. 2) is nearest in meaning to ______.

A．relieve
B．put forward
C．avoid
D．terminate

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