题目

完形填空 If you want to get along well in the US, the following dos and don'ts are ___1___. As a rule, it isn't easy to find anyone to talk to in a big city. However, here are some suggestions. ____2___, get or borrow a dog. Walk with ___3____ several times a day. Americans love dogs and usually stop ____4___ to anyone with a dog. Then, try to eat in a dining hall. People generally ___5___ the same tables and will sometimes talk to you if they see you are a stranger. Next, take your ___6__ clothes to a laundry(洗衣店). It takes about an hour to wash and dry, and many people   19.下列实验操作中有错误的是(  )A.蒸发操作时,应使混合物中的水分大部分蒸干后,停止加热,利用余热蒸干B.蒸馏操作时,应使温度计水银球靠近蒸馏烧瓶的支管口处C.浓硫酸稀释时,应该将水缓缓加入盛浓硫酸的烧杯中,边加边搅拌D.萃取分液时,分液漏斗下层液体从下口放出,上层液体从上口倒出
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