A：原子半径：钠＞磷＞氟＞氢
B：酸性： HClO4＞H2SO4＞H3PO4
C：热稳定性：碘化氢＞溴化氢＞氟化氢
D：还原性：S2- ＞Cl- ＞ F-
关于世界降水量分布规律的说法，正确的是（ ）
A: Who's that ____( boy / girl) ?
B: He's my brother.
A: Is the ____( man / woman) your mother?
B: Yes, she is.
A:____ (What's / Who's) that man?
B: Guess.
A: Is ____( he / she) your father?
B: No, he isn't.____ (She's / He's ) my teacher.
