1842年,一英国商人从广州出发沿海北上,他的经商活动最远可达[ ]
A.上海
B.厦门
C.宁波
D.福州
答案:A
计算下列各题:
1.-2(2ab-a2)+3(2a2-ab)-4(3a2-2ab) ;
2.(x2y+xy)-3(x2y-xy)-4x2y
----We’re free today. How about going out for a picnic this afternoon?
----_______.
A.Good idea
B.Never mind
C.Good luck to you
D.You’re welcome