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

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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

单项选择题

All of the following are statements about the disadvantages of fertilizers EXCEPT that（）.

A.they replenish the soil
B.they do not prevent the loss of soil
C.they are destroying the ecology
D.they pollute the nation’s water supply