某CaCl2样品中可能含有FeCl3、MgCl2、NaCl和Na2CO3中的一种或两种。将11.1克此样品溶于水只得到无色溶液，加入足量的AgNO3溶液得沉淀29.7克，由此可知所含杂
单项选择 This is ____useful book. I want to buy it. A. an B. a C. the D.\
We have made _____ clear that we are strongly against smoking in the office. A. this B. it C. that
金融危机导致大量的失业。2009年底，在我国新增的失业者中，农民工失业返乡潮尤显突出。针对这一现象，国务院要求各基层政权和自治组织尽最大努
It had been some time since Jack had seen the old man. Over the phone ,his mother told him,“Mr. Belser died last night ,The funeral is Wednesday.”Memories flashed through his mind like an old n
Once there lived a rich man 61 wanted to do something for the people of his town. 62 first he wanted to find out whether they deserved his help. In the centre of the main road into the tow
读长江中下游地区2011年春、夏季降水比较图，完成下列问题。说明：平均值为1971—2000年该季节降水量平均值。 图12 （1）结合图示，分析2011
阅读下面两首词，然后回答问题。（8分） 寻陆鸿渐不遇 唐· 皎然 移家虽带郭①，野径入桑麻。 近种篱边菊，秋来未著花。 扣门无犬吠，
