Fueled by weather, wind, and dry undergrowth, uncontrolled wildfires can bum acres of land—and consume everything in their way—in mere minutes.
(31) , more than 100,000 wildfires clear 4 million to 5 million acres of land in the U. S. every year. A wildfire moves at speeds of up to 23 kilometers an hour, consuming everything— trees, bushes, homes, even humans—in its (32)
There are three conditions that need to be (33) in order for a wildfire to burn: fuel, oxygen, and a heat source. Fuel is any material (34) a fire that will burn quickly and easily, including trees, grasses, bushes, even homes. Air supplies the oxygen a fire (35) to burn. Heat sources help spark the wildfire and bring fuel to (36) hot enough to start burning. Lightning, burning campfires or cigarettes, hot winds, and even the sun can all provide (37) heat to spark a wildfire.
(38) often harmful and destructive
A. surrounding
B. keeping
C. causing
D. making
Fueled by weather, wind, and dry undergrowth, uncontrolled wildfires can bum acres of land—and consume everything in their way—in mere minutes.
(31) , more than 100,000 wildfires clear 4 million to 5 million acres of land in the U. S. every year. A wildfire moves at speeds of up to 23 kilometers an hour, consuming everything— trees, bushes, homes, even humans—in its (32)
There are three conditions that need to be (33) in order for a wildfire to burn: fuel, oxygen, and a heat source. Fuel is any material (34) a fire that will burn quickly and easily, including trees, grasses, bushes, even homes. Air supplies the oxygen a fire (35) to burn. Heat sources help spark the wildfire and bring fuel to (36) hot enough to start burning. Lightning, burning campfires or cigarettes, hot winds, and even the sun can all provide (37) heat to spark a wildfire.
B. Above all
C. In sum
D. On average
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