1.A "Sit down and stay where you are."和"Give them a signal by shouting or whistling three times."是解答本小题的关键句子。
　　2.D 该题的答案源自"Keep up shouting or whistling always three times together. When people hear you, they will know that you are not just making noise for fun."一句中。
　　3.C "They give you two shouts, two whistles, or two gun-shots. When someone gives you a signal, it is an answer to a call for help."是答案的出处。
　　4.D 根据"Don’t just walk away. Pick off small branches and drop them as you walk so that you can find your way back."可知"当你离开原地去找水喝时，不要径直走开，要在路上留下标记，以便能找到回到原地方的路。"
　　5.B 由文章末句"The most important thing to do when you are lost is—stay in one place."和开头的"…this is what you should do."可不难得出答案。

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