下图示意某一河流的某一测站在2014年7月18日至20日测得的降雨量和径

下图示意某一河流的某一测站在2014718日至20日测得的降雨量和径流过程曲线。读图完成56题。

5.测站附近开始出现泛滥洪峰的时间约是降雨停止后(  )

A9小时    B18小时

C27小时  D36小时

6.如果未来在相同的降雨情况下,该地河流径流过程线的洪峰点却呈现向左移动的情形,这最可能是由于(  )

A.测站下游开始修筑堤防

B.测站下游大量引水灌溉

C.测站上游植被遭受破坏

D.测站上游兴建大型水库

答案

BC

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