题目

正确的实验操作对实验结果、人身安全都非常重要．下列实验操作正确的是（ ） A． 加锌粒  B． 检验氧气是否收集满 C． 移开蒸发皿  D． 气密性检查 答案：【考点】实验操作注意事项的探究；固体药品的取用；蒸发与蒸馏操作；检查装置的气密性；氧气的检验和验满． 【分析】A、取用块状固体时，不能直接如图放入，将会砸裂试管底部； B、检验氧气是否收集满，要把木条放在瓶口； C、移开正在加热的蒸发皿不可用手； D、检查装置气密性，先将导管阅读短文, 按要求回答1-5题。 If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing and turning in bed until the early hours of the morning when you eventually fall asleep. When you wake up, you don't feel refreshed, but tired and worn out and unable to face a new day. Dr. Henry Winkle, in a recent newspaper article entitled Stress and Sleep, indicates that____________________________________. Dr. Winkle says, "The more we worry, the less we sleep, the more we are unable to deal with stress. If we can find a way to get a good night's sleep," he adds, "we can often find the energy to deal with what's worrying us". So, what is a good night's sleep? Research shows that the amount of sleep which people need in order to keep healthy varies a lot. Seven hours is about the average amount, though strangely enough, sleeping longer often gives you a headache instead of making you feel more refreshed. Dr. Winkle believes that preparing for sleeping is important. People who work late should try to give themselves a short break and do something restful before going to bed. This could be watching TV or listening to music. Doing some exercise earlier in the day should help you feel physically as well as mentally tired. A bedtime drink can also help, but coffee or tea should be avoided as they contain caffeine and will keep you awake. "When you put the light out," Dr. Winkle says, "concentrate on relaxing your muscles, working slowly up from your feet, and you'll be asleep before you know it." 1. What is the best title for the text? （Please answer within 8 words.）  ___________________________________________________________________ 2. Which sentences in the text can be replaced by the following one? People shouldn't go to sleep immediately but should take a break after working late in the night. _________________________________________________________________ 3. Please fill in the blank in the second paragraph with proper words or phrases to complete the sentence. （Please answer within 10 words.）   __________________________________________________________________. 4. Someone says that the longer you sleep, the better you feel. Try to find some arguments from the text against the idea. （Please answer within 30 words.） _________________________________________________________________ 5. Translate the underlined sentence in the first paragraph into Chinese.  ___________________________________________________________________