A
Crossing your legs is an extremely common habit. 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. You won’t feel any immediate effects, but if you sit for long periods of time it’s important that 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. When you sit with your legs crossed your hips are in a twisted position, which can cause one of your pelvic bones(盆骨) to rotate. Since your pelvic bone supports your neck and spine（脊椎）, this can cause pressure on your lower and middle back and neck.
When you sit with your legs crossed for long periods of time your feet and legs get painful. This is because when one leg sits on top of the other it causes pressure on the veins and nerves in your legs and feet. It can cause numbness and/or temporary paralysis（瘫痪） in the legs, ankles, or feet. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.
1. Which of the positions is the most ideal to keep healthy?
A. Sit for a whole night while changing the crossing leg frequently.
B. Keep both of the feet flat and wide apart on the land.
C. Rest one foot on the other for less than 15 minus.
D. Put down the crossing feet immediate legs get numb.
2. According to the passage, which of the following may a crossing-leg addict suffer?
A. A sudden blood pressure increase.
B. A twisted neck and spine.
C. Permanent injuries to nerve
D. Losing the ability to walk forever.
3. What’s the main idea of the passage?
A. Ways to keep a right sitting position.
B. Tips to lower pressure to veins and nerve.
C. The health problems crossing legs will lead to.
D. Relation between habits and health problems.
【答案】1. B 2. D 3. C
【解析】
这是一篇说明文。文章主要说明了跷二郎腿坐着不利于健康，它可能影响你的血压，造成颈部和背疼痛等。
【1题详解】
细节理解题。根据第三段的Ideally, it’s best for our bodies to sit with our feet planted flat, hip width apart, on the floor. 可知，最理想的是，我们的身体最好坐着，双脚平放在地上，与臀部同宽，故选B。
【2题详解】
细节理解题。根据最后一段的It can cause numbness and/or temporary paralysis（瘫痪） in the legs, ankles, or feet 可知，交叉腿成瘾者很有可能会造成瘫痪，故选D。
【3题详解】
本文主要介绍了跷二郎腿对健康的几个危害，故选C。
