A:drink, Three coffee
B:a cup of drink, Coffee
C:a drink, A coffee
D:a drink, Three cups of coffee
A: What can you ____?
B: I can see two ____.
A: What ____ ____ they?
B: They are ____ and ____. (黑色和黄色)
我同的西沙群岛有着连绵数公里的珊瑚礁,形成珊瑚礁的珊瑚虫属于( )。
①微粒半径:r(K+)>r(S2﹣)
②氢化物的稳定性:HCl>H2S
③还原性:Cl﹣>I﹣
④氧化性:Cl2>S
⑤酸性:H2SO4>H3PO4
⑥非金属性:O>N
⑦金属性:Mg<Ca.