题目内容：
根据下列材料请回答题：
The underlined word "vulnerable" in the fourth paragraph probably means _________.
参考答案：
答案解析：
单选题：根据下列材料请回答题：The underlined word "vulnerable" in the fourth pa
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- 题目类型：单选题
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The underlined word "vulnerable" in the fourth paragraph probably means _________.