题目

如图所示，质量分别为m1、m2的两个物体通过轻弹簧连接，在力F的作用下一起沿水平方向做匀加速直线运动（m1在光滑地面上，m2在空中），力F与水平方向的夹角为θ．则m1的加速度大小为 A．   B． C．   D． 答案：DAnything that poses a challenge or a threat to our well-being is a stress.Some stresses get you going and they are good for you – without any stress at all many say our lives would be boring and would probably feel pointless. However,when the stresses undermine both our mental and physical health they are bad.In this text we shall be focusing on stress that is bad for you.When we are stressed the following happens:Blood pressure risesBreathing becomes more rapidHeart rate (pulse) risesMuscles become tenseWe do not sleep (heightened state of alertness)Most of us have varying interpretations of what stress is about and what matters.Some of us focus on what happens to us,such as breaking a bone or getting a promotion,while others think more about the event itself.How you see that stressful event will be the largest single factor that impacts on your physical and mental health.Your interpretation of event and challenges in life may decide whether they are invigorating or harmful for you.There are three broad methods you can follow to treat stress.Self help for treating stressExercise has been proven to have a beneficial effect on a person's mental and physical state.For many people exercise is an extremely useful stress buster.Alcohol and drugs will not help you manage your stress better.Either stop consuming them completely,or cut down.If you consumption of coffee and other drinks which contain caffeine is high,cut down.Eat plenty of fruit and vegetable.Make sure you have a healthy and balanced diet.Talk to your family,friends,work colleagues and your boss.Express your thoughts and worries.Stress management techniquesStress management can help you t keep away from the source of stress,change the way you view a stressful event,and lower the impact that stress might have on your body.Stress management therapy will have the objective of pursuing one or more of these approaches.MedicinesDoctors will not usually prescribe medications for coping with stress,unless the patient has an underlying illness,such as depression or some type of anxiety.If that is the case,the doctor is actually treating a mental illness.In such cases,an antidepressant may be prescribed.Bear in mind that there is a risk that all the medication will do is mask the stress,rather than help you deal and cope with it.StressPassage outlineSupporting detailsUnderstanding of stress• Stress is pressure or worry 1.by the stressors in your life.• Some stresses2.you while some others make you suffer.3.of stress• You have 4.blood pressure.• Your heart5.f aster.• Your become sleepless.• Your breath and muscles are abnormal.Attitudes towards stress• You care about what concerns6.• You pay attention to what is7.around you.• Above all,how you look at challenges affects your health.Ways to deal with stress• Exercise,a proper diet,communication help to 8.your stress while alcohol,drugs and coffee do not.• Stress management guides you how to 9.and reduce stress.• Medicines can be used to treat a mental illness but cannot solve the problem 10.