重组单词
① It's ____ the library.
② What a great ____!
③ ____ is the post office?
④ The shop is ____ to the door.
⑤ Today is Tuesday. We have ____.
某课外小组讨论、辨析以下说法,其中正确的是( )
①不锈钢和目前流通的硬币都是合金;②天然气和酒精都是再生资源;③盐酸和食醋均既是化合物又是酸;④干冰和冰既是化合物又是氧化物;⑤纯碱和烧碱都是碱;⑥矿石和溶液都是混合物.
用普通光学显微镜观察洋葱鳞片叶表皮细胞时,下列哪一结构不易看清 ( )
仓库原来有货物 56 吨,最后又用去 15 吨,现在仓库有多少吨货物?