【简答题】同义句转换。 1. After she heard the news,she seemed to be angry. After she heard the news,she _______ _______. 2. To work out the problem is hard. _______ is hard _______ work out the problem. 3. It is i...
【简答题】冬虫夏草是我国医药宝库中的一味珍贵中药药材.虫草中含有的虫草菌素,可以抵制人体内癌细胞的生长,并有降血糖的作用.虫草菌素的化学式为C 10 H 13 O 3 N 5 ,相对分子质量为251. (1)虫草菌素由______种元素组成. (2)虫草菌素中碳元素的质量分数为______.(计算结果保留一位小数)