题干
He gave me some very _____ advice on buying a house.
A：preciou
B：worthy
C：precise
D：valuable
答案(点此获取答案解析）
D
A：preciou
B：worthy
C：precise
D：valuable
Y(g)+Z (s)，以下能说明作为反应达到平衡标志的是 ( )