（甲） XO3n﹣+Xn﹣+H+→X单质+H2O（未配平）； （乙）Mm++mOH﹣=M（OH）m↓
①若n=1，则XO3n﹣中X元素为+5价，X位于周期表第ⅤA族
②若n=2，则X最高价氧化物的水化物可能与它的氢化物反应
③若m=1，则M（NO3）m溶液和氨水互滴时的现象可能不同
④若m=2，则在空气中蒸干、灼烧MSO4溶液一定能得到MSO4
⑤若m=3，则MCl3与足量氢氧化钠溶液反应一定生成M（OH）m．
A：①③
B：②③
C：①②
D：④⑤
血液的功能是____
我会查。
①“美”字共____笔，第四笔是____。
②“炭”字共____笔，第六笔是____。
Mrs Smith is Jim's mother. She loves her family very much. She often buys food, fruit and clothes for Jim and his father. Now many clothes are on sale at a good price. Mrs Smith comes to the store and she wants to buy some clothes. They have sweaters in all colors for￥15 each and sports shores for only ￥28.Mrs Smith likes the red sweater and she buys one for herself(她自己).She buys a pair of sports shores for her son. The T-shirts in the store are just ￥18! She buys a white one for Mr Smith. And that's not all. The socks, in all colors, are ￥2 each. She buys five pairs.
