下列属于亚洲与欧洲地理分界线的事物是[ ]
A．直布罗陀海峡
B．巴拿马运河
C．乌拉尔山
D．苏伊士运河
答案：C
—Would you like me to help you with the maths problem?
—___________ It’s a most difficult one.
A．With pleasure.
B．Why not?
C．That’s all right.
D．It’s my pleasure.
烘炉前需要做好哪些工作？
