单选题：What is the writer's attitude to GM foods?

题目分类：理工类
题目类型：单选题
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题目内容：

What is the writer's attitude to GM foods? A．He thinks their benefits and risks are balanced.
B．He thinks their risks outweigh their benefits.
C．He thinks their benefits outweigh their risks.
D．We cannot tell from the passage.

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