2. 外语
  3. The second line of defense in keeping plant diversity seems to be______ Biotechnology cannot help much in stopping the loss of

The second line of defense in keeping plant diversity seems to be______ Biotechnology cannot help much in stopping the loss of

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问题 The second line of defense in keeping plant diversity seems to be______
Biotechnology cannot help much in stopping the loss of genetic diversity because______
选项 A、it is not widely used by all the countries in the world.
B、it cannot make new genes.
C、it is only effect in cultivated plants.
D、the genes it moves from one plant to another are dangerous to human beings.
答案B
解析
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