2010年1月3日北京的强降雪创1951年以来历史同期日降雪量最大值，为确保道路畅通，交通部门使用了大量的融雪剂。某公司生产的融雪剂可能由NaCl、CaCl2、Na2CO3和CaCO3组成。
根据以下实验推断： 往融雪剂样品中滴加足量水，搅拌，得到无色澄清溶液，将所得溶液分两份。
（1）往其中一份溶液中滴加适量稀盐酸，无气泡产生。该融雪剂一定不含________和_______。
（2）往另一份溶液中滴加适量的碳酸钠溶液，有白色沉淀生成。该融雪剂一定含有__________。由以上实验现象，该融雪剂还可能含有__________________。
（1）CaCO3；Na2CO3(或Na2CO3；CaCO3)
（2）CaCl2；NaCl
While it is impossible to live completely free of stress,___51___. The US Department of Health and Human Services offers the following suggestions for ways to deal with stress. Try physical activity When you are nervous, angry or upset, try releasing the pressure through exercise or physical activity. Running, walking, playing tennis, or working in your garden are just some of the activities you might try. Physical exercise will relieve your anxiety and worry and help you to relax._____ 52_____ Share your stress It helps to talk to someone about your anxieties and worries. Perhaps a friend, family member, teacher or even your leader can help you a better view of what's troubling you. ____53______Knowing when to ask for help is an important step in avoiding serious problems later. 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're not eating properly, it will be more likely that you will fall into stressful situations. If stress repeatedly keeps you from sleeping, you should consult a doctor. Make time for yourself. Make a list of the things you need to do Stress can result from disorganization and a feeling that there's so much to do, and not enough time.______54_______ and as a result, you may not achieve anything. Instead, make a list of everything you have to do, then do one thing at a time, checking off each task as it is completed. Set out to do the most important tasks first. Go ahead and cry A good cry can be a healthy way to bring relief to your anxiety.______55_______
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