jià shǐ
liáo kuò
lǒng zhào
zhì liáo
xīng luó qí bù
____
āi shāng
huáng kǒng
zhù fú
dǎo yǔ
líu lián wàng fǎn
函数y=x+2x-1中自变量x的取值范围是( )
-- Are they about to have dinner?
-- Yes, it ______ in the dining room