黑龙江省哈尔滨市第六中学2018-2019学年高二6月阶段性测试英语试题

哈尔滨市第六中学2020届6月份阶段性测试 高二英语试题 第一卷 第一部分：阅读理解（共两节，满分40分） 第一节：（共15小题；每小题2分，满分30 分） A 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