科学发展观是马克思主义关于（）的世界观和方法论的集中体现。
A.发展
B.革命
C.建设
D.改革
参考答案：A
There are lots of problems in your hometown, but we're happy to see many of them___________.
A．are solving
B．are solved
C．have solved
D．are being solved
