1.今天天气很好,是吗? 2我已经当乘务员两年了。 3这道题太难了,我做不出来。 4.I have a hard time finding it until you came along. 5.Friends like you make it a lot easier to get along in a new place. 答案:1. This is great weather, isn’t it? 2. I have been a flight attendant for two years. 3. The problem is too difficult for me to work out. The problem is so difficult that I can’t work it out. 4.在你出现之前,要找到它真是有点难。 5.有了你这样的朋友使我们在一个新的地方更加容易生活。区分下列各组物质的方法①和方法②均正确的是( )
选项
需区分的物质
方法①
方法②
A
硬水和软水
观察颜色
煮沸
B
碳酸氢铵和磷矿粉
加氢氧化钙研磨
加适量水溶解
C
碳酸钾溶液和氢氧化钾溶液
滴加酚酞溶液
测定pH
D
黄铜与黄金
观察颜色
在空气中加热A.AB.BC.CD.D