一 I have made great progress in spoken English since last year.
一 Well done! I am sure you'll be good at it soon.
A:improved a lot
B:practiced a lot
C:done badly
选项
假设
结论
A
甲为S
戊可能是氧气
B
甲为Al(OH)3
丁可能是氢氧化钠溶液
C
甲为Fe
丁可能是硝酸
D
甲为Na2CO3溶液
戊可能是CO2
Is she your mother?