It ______ him an hour to play basketball every day.
A:spends
B:took
C:costs
D:takes
针对如图所示的情景,下列说法正确的是()
下面四个条件中,使a>b成立的充分而不必要的条件是____ .(填写序号)
①a>b﹣1; ②a>b+1; ③a2>b2 ;④a3>b3.