A.toB.forC.withD.their
A. to
B. for
C. with
D. their
A.atB.withC.asD.for
A. at
B. with
C. as
D. for
地球表面大约有70%的面积被水覆盖,水的总量约有13.6亿立方公里,其中淡水所占比例很小,可利用的淡水资源约占水总量的()。
A. 0.65%
B. 8.9%
C. 11.28%
D. 21.42%
A.atB.withinC.inD.during
A. at
B. within
C. in
D. during