”可知：每三个月要更换一个新牙刷，故题设说法“一年中至少要用四个牙刷”是正确的。
06B解析：由短文第一段第四句可知“在森林里迷路时应待在原地不动”。07A解析：由短文第一段最后一句可知“当人们听到呼救声时，他们就会知道你需要帮助以及你的位置”。08D解析：由短文第二段可知“如果天黑前还没有人帮助你，你应该用小树和树枝等建造一座小房子”。09D解析：由短文第三段可知“当你出去寻找水时，应在路上留下小树枝做记号”。10C解析：通读全文可知，短文讲述了在森林里迷路之后该如何做。故C项符合文章大意。Ⅳ01Sheraisedmo
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