题目

用下列实验装置进行相应实验,能达到实验目的的是( )A.用图1所示装置除去Cl2中含有的少量HClB.用图2所示装置蒸干NH4Cl饱和溶液制备NH4Cl晶体C.用图3所示装置制取少量纯净的CO2气体D.用图4所示装置分离CCl4萃取碘水后已分层的有机层和水层  答案：D 【解析】Cl2、HCl都与NaOH反应,可以选择饱和食盐水除去Cl2中的HCl,A项错;NH4Cl不稳定,受热会分解,B项错;纯碱为粉末状易溶物,不能放于带孔的板上,同时制得的CO2中会混有HCl和H2O,C项错;CCl4与水互不相溶,且CCl4的密度比水大,位于水的下层,可用分液漏斗分离,D项正确。   用方框中所给单词的适当形式填空，使短文通顺、正确、连贯(每个单词限用一次)。 next cause　 find　 both　 parent safe　 great　 when　 that　 you If you feel stressed out, what do you do? Do some exercise or drink some tea? These may　 61 work. You may ask what else you can do to deal with your stress. 　　 The first step is to know 62 you feel stressed. Early signs include back pain. headache, sleeping trouble, weight loss(体重减轻)and so on . 　 The 　63　 step is to choose a way to deal with the stress. If you can, get rid of the cause of the stress. It is very helpful to find out the reasons 　64 make you feel stressed. 　 Change your attitude towards your stress, positive attitude can 　 65　 help you keep away from the stress. 　 Face up to what is　 66　 the stress until it isn't stressful anymore. 　 Find a new hobby or sport. Take time to do what you enjoy. 　 Don't always hide　 67 feelings. Don't be afraid to cry. Crying can help you let out bad emotions. 　68 　a stress-free place in your home. Your room would be a nice place for you. You’ll feel calm and　 69 in your own room. 　 If you feel that you cannot deal with the stress on your own, think about outside help. You can talk to your　 70　 and friends. They may offer you some help.