A:若 m//α,n⊂α, 则 m//n
B:若 α∩β=m,m⊥n, 则 n⊥α
C:若m//α,n//α,则m//n
D:若 m//α,m⊂β,α∩β=n, 则 m//n
How many _____ do you want?
实验一
实验二
实验三
一____were you when I was in town?
—In a village.