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  3. PASSAGE ONE How does a snake react first when it meets a potential enemy?

PASSAGE ONE How does a snake react first when it meets a potential enemy?

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问题 PASSAGE ONE
How does a snake react first when it meets a potential enemy?
选项
答案To try to escape observation．
解析 根据题干中的react first定位到首段第3句。该句列举了四种蛇对外界反应的行为模式。题目中的react first对应原文中的the first reaction，故作表语的不定式短语为本题答案所在。因题目用does来提问，故需用动词不定式To try to escape observation来回答。
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