抛物线y=(x+3)2-2的对称轴是 ( )
A:直线x=3
B:直线x=-3
C:直线x=-2
D:直线x=2
When the gatekeeper saw a man ____ (hide) in his room, he called the police.
甲、乙两种固体物质的溶解度曲线如图所示,下列说法正确的是( )