A:which
B:that
C:where
D:whe
若三个点P(1,1),A(2,-4),B(x,-9)共线,则x=( )
⑴小心的____ ⑵危险____ ⑶走进____ ⑷乱扔垃圾____
⑸意味着____ ⑹禁止吃喝____
càn làn
nínɡ jié
fènɡ xì
jūn yún
____
guī lǜ
hén jì
fù gài
jiàn zhù