材料：旅游已经成为人们的一种生活方式。广州的小明同学春节期间外出旅游，体验“魅力中国之旅”。

完形填空。阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。

    On that particular day after I finished giving my training course, I took a flight home. Upon 1 the plane, I noticed a boy who was around eight years old, sitting in the window seat 2 mine. Trying my best to be 3, I said “hello” and introduced myself, and he told me his name was Bradley. We started a 4 and within minutes, he took me into his confidence, saying, “This is the first time I have ever been on a plane. I'm a little bit 5.” I managed to 6 him.

    As we ascended (上升), he looked out of the window and started describing excitedly everything he was 7. Then he told me he needed to go to the bathroom, 8 I stood up to let him out into the aisle. It was then that I noticed the brace (支柱) on his legs. Bradley, 9 made his way down to the bathroom and back. Sitting back down, he 10, “I have muscular dystrophy(肌肉萎缩症), and so does my sister, who's in a 11 now.”

    As we descended (下降), he looked over, smiled, and spoke in a low, almost 12 voice, “You know, I was really 13 about who would sit beside me on the plane. I was afraid it would be someone who didn't want to 14 with me. I'm so 15 I sat beside you.”

    16 the whole experience later that night, I was reminded of the 17 of being open to the moment. Now when 18get(s) rough, I look out of the window, try to see what images the clouds are painting in the sky, 19 remember Bradley, the beautiful child who taught me that 20.

    Have you experienced times when you feel like you're under too much pressure? I think most of you will say yes. Actually, many things can strike us beyond our control. With an annoying mix of late trains, missed appointments and work deadlines, many of us are living in a constant state of stress. Experts warn, our modern lifestyles means that stress is almost continuous, and comes without the natural release that either fighting or fleeing might provide.____ Conditions vary from mood swings(情绪波动) to anxiety, irritability, nervousness and tiredness. In extreme cases, it can even cause headaches, muscle cramps, and digestive problems. But there are a number of things we can do to manage the symptoms.

    ____

    Balancing blood sugar is essential in lowering stress. To maintain its level, you can try to have one small meal every two-to-three hours that contains protein, for example, breakfast, lunch and dinner plus a mid-morning and mid-afternoon snack. In this case, your blood sugar will be steady.____

    Laugh as you like.

    ____Many studies show that laughter boosts our energy, decreases stress hormones, improves immunity and lessens pains. Try to find humor in life and engage in activities that make you laugh. Don't feel guilty about doing what you love. It will work its magic in your body.

    Schedule your workout timing.

    It could be the time, rather than the way that determines how effective your workouts would be.____Do energy-forming exercises like running or aerobics in the morning, and milder activities in the evening. Try a walk at the end of the day to calm your mind and stretch your muscles.

A. Eat little and often.

B. So will your mood swings.

C. Laughter is the best medicine.

D. These things are activated by laughing

E. The aim of exercise is to boost your energy.

F. Adapt your exercise routine to the biological clock.

G. Living with it can lead to a whole range of health problems.