Which of the following doesn't have a linking sound (连读)?
A:get out
B:an orange
C:sit down
D:a tree
读俄罗斯局部地区河流分布图,完成下列各题。
如图为甲、乙两物质(均不含结晶水)的溶解度曲线,下列说法错误的是( )