根据拼音写汉字或给划线字注音。
____
xiù
rú
鲜为人知
两____清风
鞠躬尽瘁
妇____皆知
彷徨
yín
kuàng
bì
zhì
平沙无____
当之无愧
热泪盈____
锋芒____露
____友
I've not seen him for a long time. He becomes stronger and more polite .
将一定溶质的质量分数的NaCl溶液,逐渐加水稀释,随着水的加入溶液中下列变化正确的是( )