A:Fe3+ SO42﹣ H+ Cl﹣
B:Mg2+ Cl﹣ OH﹣ Na+
C:H+ Ba2+ NO3﹣ SO42﹣
D:H+ Na+ K+ NO3﹣
照样子,写句子。
①新王后很美丽,但心眼很坏。
____,但____。
②雪花像洁白的羽毛从天上飘下来。
____像____。
Betty doesn't have ______ for next weekend.
I want to buy _________ piano for my daughter as the birthday gift. She's good at playing ________ piano. What do you think of _________ black one?