单项选择题

Which of the following can be a disadvantage of search agents

A．Lack of counseling.
B．Limited number of visits.
C．Lower efficiency.
D．Fewer successful matches.
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单项选择题
Which of the following is NOT mentioned about recombinant DNA technology
A．It can bring about rapid and radical genetic changes in life forms.
B．It can be used to restructure DNA molecules to produce new desired plant and animal breeds.
C．It may increase the risk of producing some unexpected diseases.
D．It proves an effective way to cure cancer and other incurable diseases.
单项选择题
The author's attitude towards genetic technologies is ________.
A．enthusiastic
B．indifferent
C．critical
D．objective
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