题目

________ coming to China, my only experience with Chinese cooking was in America, with Chinese food that ________ to suit American tastes. A . Before... had changed B . While... was changed C . Prior to...had been changed D . When... changed 答案：C4．如图是某同学用来除去水中难溶性杂质时所采用的过滤装置图．试回答：（1）写出标号仪器的名称：a铁架台，b漏斗，c烧杯．（2）该图中存在的三处明显错误是：①未用玻璃棒引流②液面高于滤纸边缘③漏斗的下端管口没有紧靠烧杯内壁（3）在过滤时，若经过两次过滤后滤液仍然浑浊，其原因可能是：滤纸破损，液面高于滤纸边缘，仪器不干净（要求写出两个方面的原因）．（4）该方法得到的净水是混合物（纯净物还是混合物），原因是水中仍含有可溶性杂质．