--What's this?
--It's a tiger. It's _____.
A:big
B:a big
下列关于秦岭---淮河一线地理意义的叙述,正确的是
——Are you __________ to go on a trip to Taiwan?——Yes. But I don't have ___________.
现在车上有多少人?应怎样列式。( )