Premier Wen Jiabao said that if we worked hard and____ optimistic,we were_____ win the war against the finanical crisis. A. were; bounding B. were; bound to C.was; bounding to D.had; bounded to 答案:B 解析: 考查谓语动词时态及bound的用法。work hard and were optimistic并列;be bound to do sth.注定,一定会做某事为固定搭配。
鉴别碳酸钠和碳酸氢钠两种白色固体,下列方法可行的是( ) A.分别加热,观察是否有气体产生 B.分别溶于水,加Ba(OH)2溶液观察是否有沉淀产生 C.分别溶于水,滴加CaCl2溶液,观察是否有沉淀生成 D.分别溶于水,通入CO2观察是否有NaHCO3产生