New York is one of ____ in the world.
A:the large cities
B:the large city
C:the largest cities
D:the largest city
已知正三角形OAB中,点O为原点,点B的坐标是(-3,4),点A在第一象限,向量m→=(-1,0),记向量m→与向量OA→的夹角为α,则sinα的值为( )
Jack went swimming yesterday.
下面是一个不完整的图示,请你帮助完成。