单选题：What do we learn from the last paragraph________?

题目分类：理工类
题目类型：单选题
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题目内容：

What do we learn from the last paragraph________? A．Biotechnology can solve all our future energy problems.
B．Biological power is cheaper than nuclear power.
C．Biological power may not be as dangerous as nuclear power.
D．Biological power will keep all its promises.

参考答案：

答案解析：

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