People______better access to health care than they used to,and they're living longer as result.
A:will have
B:have
C:had
D:had had
二战后,世界人口流动的主要原因是世界各国( )
A;B;C三种物质的溶解度曲线如图所示.下列分析正确的是( )
— .
如图所示,以下判断正确的是( )