题目

完形填空 先通读下面短文，掌握其大意，然后从每题所给的四个选项中选出最佳选项。 “She’s coming. Hide it quickly!” The girls quickly   1   it under the table. It seemed that nothing had happened. When Miss Wang came into the classroom, everyone stood up and greeted her. She gave them a smile. The girls   2   that there was sadness in her eyes. They wished with all their hearts that they could do   3   to help her, but there was nothing that they could do. Miss Wang told them that she would   4  them. She explained that she wanted 17．下列关于有机物的叙述正确的是（　　）A．乙烷与氯气光照反应可以制得较纯净的1，2-二氯乙烷B．苯中的化学键都是非极性键C．煤的干馏属于物理变化D．涤纶、酚醛树脂和蛋白质都属于高分子化合物