A:hadn’t listened
B:haven’t listened
C:don’t liste
D:wasn’t listening
新鲜的牛奶常采用的保存方法是( )
新制备的氯水,显____色,说明氯水中有____分子存在。向氯水中滴入几滴AgNO3溶液,立即有____生成,说明氯水中有____存在。蓝色石蕊试纸遇到氯水后,首先变红,但很快又褪色,这是因为____。氯水经光照后,颜色逐渐消失,并放出无色____,该反应的化学方程式为____。
以下物品应用平面镜成像原理的是( )
将正确的图片和句子配对
① It's yellow. It's small. It goes “Peep,peep”.
② It's fat. It goes “Oink… oink”.
③ It's big. It goes “ Moo…moo”.
④ It's thin. It's in the tree.
⑤ It's yellow. It goes “ Quack …quack”.
____ ____ ____ ____ ____