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  3. In the interest of lightness of weight, everything you carry in your pack should serve as many purposes as possible. Clothing an

In the interest of lightness of weight, everything you carry in your pack should serve as many purposes as possible. Clothing an

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问题     In the interest of lightness of weight, everything you carry in your pack should serve as many purposes as possible. Clothing and sleeping gear constitute the greatest amount of bulk in your pack and probably the most weight. Thus, you should choose clothes and sleeping gear with a great deal of versatility in mind. Get the maximum use from the various items of clothing and sleeping gear and combinations of them.
    For example, instead of two pairs of long pants, carry one pair of long pants and a pair of shorts. You can wear the shorts alone, or the long pants alone, or both at the same time.
    The same with shirts. Instead of one heavy shirt, carry two medium-weight shirts-one with long sleeves, one with short sleeves. Carry two light-weight wool sweaters instead of a heavy sweater or jacket. Even better, carry a light-weight wool sweater and a wind shell. This gives you three possibilities: sweater alone, shell alone, sweater and shell together. Additionally, you will be warmer in several layers of clothing than in one layer of heavy clothing. The shell, light sweater, and two shirts will keep you warmer than one shirt and a heavy sweater or jacket.
    This same layering principle applies when you sleep. Better to have a light-weight sleeping bag and wear several layers of clothing than to have a heavy-duty, low-temperature sleeping bag.
    Of course, different people sleep warm or cold, depending upon their body metabolism. And those needs should obviously be considered in the assembly of clothes they carry.
    Should you find yourself in a freak situation such as zero temperature, when you start out in weather that should not have dropped below 30 degrees, there are a number of things you can do to improve the warmth of your sleep.
    (1) You can sleep inside a tent, of course. This increases the temperature by 5 to 10 degrees and it cuts the wind chill factor substantially. (2) Camp out of the wind if possible. This cuts down the wind chill factor. (3) Place your sleeping bags close together. This retains the heat for all of you. (4) Camp on the side of a hill instead of on the valley floor, especially on clear nights. Warmer air lifts up and off the valley floor on clear nights. There can be as much as 15 degrees difference between the temperature on the side of the hill and that on the valley floor.
Why is it warmer on the side of a hill than on the valley floor?
选项 A、Because warmer air lifts up and off the valley floor, especially on clear nights.
B、Because there is difference between the temperature.
C、Because cold wind blows down to the valley.
D、No information is mentioned in the passage.
答案A
解析 本题的答案不难在文章中找到依据。文章最后一段中有这么一句话：Camp on the side of a hill instead of on the valley floor，especially on clear nights．Warmer air lifts up and off the valley floor on clear nights。B项中只说有温差，但为何存在温差并未说明，还是未能回答本题所提出的问题。C项在文中根本未提及，而D项更是与文章内容不相符，因此A项“因为暖气流上升离开谷底，尤其是在晴朗的夜晚。”为本题正确答案。
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