题目

在下列个句中的空白处填入一个适当的词，或用括号中所给词的正确形式填空： （1） The teacher, together with some of her students, (be) preparing for their performance now. （2） It is dangerous to carelessly throw about (light) cigarettes like this. （3） He made every effort to seek a position he could get a higher salary and a quick promotion. （4） The doctor left hurriedly without a word and came back after seemed to be half an hour. （5） It made us overjoyed to hear that he is (admit) into Beijing Universi在溶液中能大量共存并且溶液为无色透明的离子组是 A．Ca2＋、Na＋、NO3－、CO32－         B．Mg2＋、C1－、OH－、SO42－ C．K＋、Cl－、CO32－、NO3－           D．Ca2＋、Na＋、Cu2＋、NO3