河北武邑中学2018-2019学年高一寒假作业

英语学科（第23期） 命制人：郑陆浩 审查人：魏军霞

班级_________ 学生姓名__________ 家长签字________________

第二部分 阅读理解 阅读下列短文，从每小题所给的A、B、C、D四个选项中，选出最佳选项，并在答题纸上将其涂黑。

Is It Bad to Cross Your Legs When You Sit?

　　Crossing your legs is an extremely common habit; most people don't even notice that they're doing it when they sit down. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

　　A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason this happens is because the blood in your legs has to work against gravity to be pumped back to your heart, crossing one leg over the other increases resistance, making it even harder for the blood to circulate. This causes your body to increase your blood pressure to push the blood back to the heart. You won't feel any immediate effects, but if you sit for long periods of time it's important that you take note of how long you have your legs crossed for. You shouldn't have your legs crossed for more than 15 minutes, and it's important that you get up and walk around at least once every hour.

　　Crossing your legs can also lead to neck and back pain. Ideally, it's best for our bodies to sit with our feet planted flat, hip width apart, on the floor, but it's not easy to maintain perfect posture all day at the office. When you sit with your legs crossed your hips are in a twisted position, which can cause one of your pelvic bones to rotate. Since your pelvic bone supports your neck and spine, this can cause pressure on your lower and middle back and neck.

You also might notice that when you sit with your legs crossed for long periods of time your feet and legs get tingly or have the feeling of being asleep. This is