This passage is mainly It can be inferred from the text that the synthesizing DNA technology should be used

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问题 This passage is mainly
It can be inferred from the text that the synthesizing DNA technology should be used

选项 A、extravagantly and freely.
B、flexibly and excessively.
C、reasonably and cautiously.
D、openly and vigorously.

答案C

解析 题干问:"根据原文,合成DNA的技术应该…"。根据文章第1自然段和第5自然段可以看出合成 DNA的技术应该"合理地、谨慎地"使用而不能被不法分子所利用。而选项"奢侈地和自由地","灵活地和过分地"以及"公开地和热情地"皆不符合题意。
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