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.