我国生态环境建设的重点是( )。
A．黄河中游
B．风沙区
C．草原
D．南方丘陵红壤区
E．北方土石山区
参考答案：A,B,C
巴西最大的铁矿山是_______。
We thought of selling this old furniture, but we've decided to _____ it, It might be valuable.
[ ]
A. hold on to
B. keep up with
C. turn to
D. look after
