【简答题】B I find it annoying and funny when I think about how we use protective or decorative wrappings ' (装饰性包装)in this country. When I come home from the supermarket and start to unpack, I am always shocked...
【单选题】The firemen tried their best to _______ the fire but in vain.
【单选题】The 19th-century scholars tried to ______ the origins of modern languages to ancient Hebrew.
【简答题】已知A由一种或几种金属组成,为确定A的组成,进行如下图所示的实验(部分产物巳略去).已知B、E均为只含一种溶质的溶液,E溶液呈蓝色,C、D均为纯净物. (1)G是 _________ (填名称). (2)①处发生的反应属于 _________ (填基本反应类型). (3)写出有关反应的化学方程式:② _________ ;④ _________ . (4)根据以上信息,对A的组成作出的判断正确的是...
【简答题】已知A由一种或几种金属组成,为确定A的组成,进行如下图所示的实验(部分产物巳略去)。已知B、E均为只含一种溶质的溶液,E溶液呈蓝色,C、D均为纯净物。 (1)G是___________(填名称)。 (2)①处发生的反应属于____________(填基本反应类型)。 (3)写出有关反应的化学方程式: ②________________________________________________...
【单选题】The shop girl almost called me stupid when I said that camera wasn't to my ______ and a bit cheap-looking.
【简答题】Firemen tried to ________________ (扑灭) the fire and save the injured.