She decided to visit Shanghai Expo for her summer vacation.
A:go
B:to go
C:going
D:goes
计算:(﹣4)÷(﹣12)=____
设集合M=x|x=kπ2+π4,k∈Z,N=x|x=kπ±π4,k∈Z,则M、N的关系是( )