取少量下列物质分别放入水中,充分搅拌后能形成溶液的是()
A:氢氧化钠
B:面粉
C:泥土
D:汽油
Many students write to Language Doctor to _______ advice about learning English .
— was the book sale in your school library last Sunday?
—Great.
①对人不讲理,很难与别人友好相处
②是否文明礼貌,不仅仅是个人的私事和小事
③传统的礼仪必须适应现代社会发展的需要
④外交礼仪周全,各国就能相互尊重与文明交往