在我国南方水资源丰富的地方,许多村落都沿河分布,主要原因是[ ]
A、沿河地带土壤肥沃
B、沿河地带地形平坦
C、沿河地带渔业资源丰富
D、沿河地带交通便利
答案:D
I can see a boat __________ a river. [ ]
A. on
B. in
C. at
D. about
粮食水分含量为多少时霉菌繁殖产毒能力最强()
A.13%~14%
B.14%~16%
C.17%~18%
D.18%~19%
E.19%~20%