在生物体内，某些重要化合物的元素组成及其相互关系如图所示。请据图分析回答下列问题：

    There are many ways you can save money at the supermarket . Here are some of the best:

    Make a list and follow it.

    The list is about your needs: the notebooks you're out of and the food you need for daily meals. When you buy the things that are not on the list, you are wasting your money.

    Compare the prices.

    The biggest package isn't always the cheapest. Sometimes it is cheaper to buy in bulk*. So it's useful for you to compare the prices.

    Ditch the basket or cart.

    If you're going to the supermarket just to pick up milk and bread, don't use a basket. Baskets let people to buy more. Only use a basket or a shopping cart if it's really necessary.

    Make one large trip instead of several small ones.

    Each time you enter the supermarket, you get another chance to spend. By reducing the times of your trips, you're saving both time and money.

    Shop when you are full.

    If you go to the supermarket for milk on a Sunday morning without eating breakfast, you are likely to come home with bread, sandwiches and orange juice.

一只蝴蝶从敞开的窗户飞进采，在房间里一圈一圈地飞舞，显然，它迷路了，无法

飞出房子，原因是它总在房间顶部空间寻找出路，总不往低处飞一一那低一点的位置就

有敞开着的窗户。甚至有好几次，它都飞到离窗户至多两三寸的位置了．可就是不肯再

飞低一点！最终，这只不肯低飞一点的蝴蝶耗尽了气力，落在桌子上气息奄奄……

常有人抱怨人生的路越走越窄，甚至看不到一丝光亮，这是不是有些像这只蝴蝶呢？

要求选准角度，明确立意，自选文体，自拟标题；不要脱离材料内容及含意的范围作文，不要套作，不得抄袭，不得少于800字。