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  3. For many Americans, summer is a time to put on swim wear and spend time at the sea or a lake. But before going anywhere, they ma

For many Americans, summer is a time to put on swim wear and spend time at the sea or a lake. But before going anywhere, they ma

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问题     For many Americans, summer is a time to put on swim wear and spend time at the sea or a lake. But before going anywhere, they may want to lose any extra weight【B1】______during the winter.
    So, where does one get started? Health experts have long【B2】______the importance of physical activity. Exercise not only improves your appearance. It can also improve your health. Exercise helps to reduce the【B3】______of some diseases. They include heart disease, stroke, and even some kinds of cancer.
    Physical activity is also known to increase the【B4】______of endorphins(内啡肽). These chemicals reduce feelings of pain. They also help people feel more happy and【B5】______. The Centres for Disease Control【B6】______physical activity as anything that gets your body moving. And, it says there are two separate but【B7】______ important kinds of physical activity. Aerobic or cardio exercise gets your heart【B8】______going faster and increases your breathing. Muscle-strengthening activities help build and strengthen muscle groups in the body. More recent research suggested that those gains are the same whether you exercise for short periods over five days or longer sessions over two or three days.【B9】______. Each exercise period should be at least ten minutes long. The total amount of activity should be spread over at least three days throughout the week. Most importantly,【B10】______
    Whatever kind of exercise you choose, experts agree that you should start small and work your way up.【B11】______.
【B9】
选项
答案In addition, the newer suggestions say any exercise plan should include at least two days of muscle training
解析 suggestions, exercise plan, include, muscle training
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