完形填空The characteristics of a hurricane are powerful winds,dr

完形填空
The characteristics of a hurricane are powerful winds,driving rain and raging seas.Although a stormmust have 1 blowing at least seventy-four miles an hour to be classified as a hurricane,it is not unusual to have winds above one hundred and fifty miles per hour in a 2 hurricane.The entire storm system can be five hundred miles in diameter,3 lines of clouds that spiral toward a center salled the “eye”.Within the eye itself,which is about 15miles 4 ,the air is actually calm and cloudless.Butthis eye is enclosed by a towering wall of thick clouds 5 the storm’s heaviest rains and highest windsare found.
All hurricanes begin in the 6 seas and moist winds of the tropics .They form in 7 of two narrow bands to the north and south of the equator.For weeks,the blistering 8 beats down on the ocean water.Slowly the air above the sea becomes 9 and begins to swirl.More hor,moist 10 is pulled skyward Gradually,this circle grows larger and spins 11 .As the hot,moist air at the top is cooled,great rain clouds are supply of heat,and moisture is finally 12 off.
The hurricanes that 13 North America usually from over the Atlantic Ocean.Storms formed over the west coast of Mexico are less dangerous 14 they tend to head out over the Pacific Ocean rather than toward land,The greatest damage usually comes from the hurricanes that begin in the western Pacific because they often strike heavily 15 regions.

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