A. SELF B. ELSE C. OWN D. SHELFREAD THE FOLLOWING PASSAGE AND MARK THE...

Câu 35:

A. self

B. else

C. own

D. shelf

Read the following passage and mark the letter A, B, C, or D on your answer sheet to

indicate the correct answer to each of the questions.

Probably the most important factor governing the severity of forest fires is weather. Hot, dry

weather lowers the moisture content of fuels. Once a fire has started, wind is extremely

critical

because it influences the oxygen supply and the rate of spread. Forest type and forest

conditions are also important factors. For example, fire is more likely to occur in conifers

than in hardwoods; slash-covered or brush areas are especially hazardous because the rate at

which combustion consumes fuel is proportional to fuel volume.

Some fires are caused by lightning; others are caused by people. Those caused by people

may be accidental or intentional (incendiary). The causes of fire in the United States show

large regional differences. In the Rocky Mountains more than 70 percent of the fires are

caused by lightning, whereas incendiary fires amount to only about 1 percent. In contrast,

more than 40 percent of the fires in the South are incendiary, whereas lightning causes only

1 percent.