题目

While it is impossible to live completely free of stress, it is possible to prevent stress as well as reduce its effect when it can’t be avoided. The US Department of Health and Human Services offers the following suggestions for ways to deal with stress. l         Try physical activity When you are nervous, angry or upset, try releasing (释放) the pressure through exercise or physical activity. ___36___ l         Take care of yourself You should make every effort to eat well and get enough rest. If you easily get angry and cannot sleep well enough, or if you are某DNA分子中A＋T占整个DNA分子碱基总数的44%，其中一条链(a)上的G占该链碱基总数的21%，那么，对应的另一条互补链(b)上的G占该链碱基总数的比例是                                                         A．35%B．29%C．28%D．21%