题目

阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。A few months ago the pilotof a small plane had an unusual 1. He took off from anairport runway on a training 2 . A strong wind blew the plane sideways, andit 3 the top of a tree. Both wheels of the planewere knocked 4, but luckily to him, theplane did not crash.The pilot sent a radio 5to the airport. He did notknow how to 6 without wheels. The airport controller 7 to help the pilot. He telephoned the airportfiremen and told them what to do.A fireman saw a long, openlorr实验室里从海藻中提取碘的流程图如图1所示：（1）指出制取碘的过程中有关的实验操作名称：①___________，②___________．操作②中要用到分液漏斗，在使用分液漏斗前要检查是否漏水，检查方法是_______________（2）灼烧海藻时，除需要三脚架外，还需要用到的仪器是___________（从下列仪器中选择所需的仪器，将标号字母填写在空白处）．A烧杯 B坩埚 C表面皿 D泥三角 E酒精灯 F干燥器（3）提取碘的过程中，可供选择的有机溶剂是___________（填字母序号）．A．酒精 B．四氯化碳 C．苯 理由是____________________（4）进行上述蒸馏操作时，最后晶体碘在___________里聚集．（5）含碘的有机物溶液中提取碘和回收有机溶剂，还需要经过蒸馏，观察如图2实验装置，指出其错误之处，并指出正确操作___________。