阅读下面短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
D
    In her outstanding book, “Choose the Happiness Habit”, Pam Golden wrote, “Take the story of two twin brothers for example. One grew up and became an alcoholic (酒鬼), while the other became a successful businessman. When asked why he became an alcoholic, the alcoholic replied, “Because my father was a drunk.” However, the successful businessman's answer was also “Because my father was a drunk.” when asked why he succeeded. The same background. The same upbringing (培养). However, the results were quite different. Why? The reason is that they had different choices. The brothers chose different thoughts which formed the situations they found themselves in at last, so they had different experiences.
    There was a time in my life when I thought difficulty was due to “bad luck”. Have you ever heard the saying “When it rains, it pours”? That was my answer when others asked me how things were going on when I was in trouble. So what do you think I got? “RAIN”. More and more “RAIN”. I couldn't understand why bad luck was always with me.
   Pam Golden says, “You're either living in the problem or you’re living in the solution.” Now, when I'm faced with what I used to think was a negative (消极的) situation, I use a different way to think about it. I force myself to replace those negative thoughts that make me lose heart in my mind with positive thoughts which encourage me to fight against the difficulty bravely. Sometimes I write down some ideas that may be a solution, which I combine with the lessons I have learned from the bad situations and the difficulties that troubled me in the past, and often, I find a solution to the problem soon. It seems that I should thank the difficulty I met with. The RAIN that poured in my world has become great experiences that provide me with valuable experience, from which I can benefit.
    Now, it doesn't “rain ” as much in my life as it used to. In fact, most days are beautiful, cloudless and sunny! Sometimes I do get a rain, but I think it makes me stronger just like the rain helps plants grow up.

某地某日出现了一种灾害性天气﹣﹣龙卷风，平时善于观察的杨阳同学将龙卷风始发地 A 及运动方向，在经纬网地图上进行了较为准确的标示． 据此回答下面小题．

用下列物质的序号填空: A．硝酸钾  B．硝酸铵  C．氢气  D．一氧化碳  e.干冰  f.熟石灰  g.烧碱

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Here, sleep experts clear up some of the biggest misunderstandings about sleep they see with their patients, which could weaken your ability to have a night of good sleep.

Myth: ____

    The latest research shows that the right amount of sleep may vary from person to person and should leave you feeling energized the next day. I'm a sleep doctor. Take myself for example. ____.

Myth: Don't fall asleep with the TV on.

    I've cured more people suffering from sleep problems than you can imagine by telling  people it's OK to fall asleep with the TV on. ____Control the watching time so it doesn't affect your sleep later in the night.

Myth: You can catch up on lost sleep on the weekend.

    ____ A Harvard study found that even if you sleep for an extra 10 hours on the weekend to make up for only sleeping six hours a night for two weeks, those extra hours won't improve  your reaction times or ability to focus. Plus, sleeping late throws off your biological clock, which can lead to obesity, diabetes, and heart disease.

Myth: Alcohol can help you rest easy.

    ____ Alcohol may relax you so you nod off quicker, but studies show you'll wake up more and get less of deep sleep you need to feel rested.

A. You need 8 hours' sleep a night. B. A lack of sleep can cause anxiety. C. We take unscheduled naps during the weekend. D. I've been a 6.5-hour sleeper my entire adult life. E. Many people can't turn off their brains, but watching TV helps. F. People commonly use alcohol to fall asleep, but it doesn't work. G. You can't make up for too little sleep by sleeping more at weekends.

支撑我国国民经济建设与发展的基础是（   ）