A:①②
B:①④
C:②③
D:②④
俄罗斯的平原有( )
在△ABC中,内角A,B,C所对的边分别为a,b,c,已知△ABC的面积为315b-c=2,cosA=-14,则a的值为____ 。
My grandparents are ____ ____ the country life, and they wouldn't like to live with us.
—______ have you got?
—A cat.