It can be inferred from the passage that ______. A.if dams were built in river basins, the downstream ecology remained the same B.governments have to be responsible for the changes caused by the constructions of dams C.the results of controlling water flows by engineers can be well forecasted D.a dam can bring economical advantages for almost a century
A.A.if B.governments C.the D.a
【参考答案】
B 解析：推断题。文章第二段提到修整水坝会对生态有影响，而在过去，这些问题因信息缺乏还可理解，但是现在政府不会再......