我国地势总特征是[ ]
A．西高东低，逐渐下降
B．西高东低，呈三级阶梯状分布
C．东高西低，呈三级阶梯状分布
D．东高西低，逐级下降
答案：B
The waterfall can be seen ____. Its sound may be heard ____ twomiles. It looks even more
beautiful ____, I think. [ ]
A. at a distance; in the distance of; from a distance
B. from a distance; in the distance of; at a distance
C. in the distance; from a distance; at a distance
D. in the distance; at a distance of; from a distance
未煅烧或烧结的白云石
