单项选择题

According to the selection，streams overtop their banks partly because（）.

A.material from higher land is washed into them
B.ditches and drains lead into them
C.rivers become too swift
D.snow melts more rapidly nowadays

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单项选择题

All of the following cause floods EXCEPT（）.

A.heavy rain
B.melting snow
C.increasing storm runoff
D.porous soil

单项选择题

The floods which are given most publicity（）.

A.cause no damage
B.cause the most damage
C.cause less agricultural damage than the many smaller，more frequent floods
D.far exceed the smaller，more frequent floods in agricultural loss