A. COMPETENCE B. BLOCK C. ILLNESS D. CAPACITY(61-65). READ THE PAS...

60. a. competence

b. block

c. illness

d. capacity

(61-65). Read the passage below carefully and choose the correct answer a, b, c or d.

Today I’d like to begin a discussion on the problem of the heating up of the earth. First,

we’ll touch on the relationship between fluorocarbon and the ozone layer. You probably

remember that the ozone layer is the protective shield around the earth. It is important to

all life, because it filters out harmful ultraviolet light from the sun. Ozone itself, a form of

oxygen, is regularly destroyed by natural chemical processes.

The problem now is that too much of the ozone layer is being destroyed. Scientists

suspect that certain chemicals, such as fluorocarbons, are contributing to the depletion of

the ozone layer. And how do we use fluorocarbons? The most common uses are in spray

cans and cooling systems. The chemical pollution from these fluorocarbons can account

for some of the ozone losses that have been reported. There are, however, new studies

liking the sun itself to the * depletion of the ozone layer. We’ll go into that new study

more next time.

– protective shield (n): lớp bảo vệ, màng bảo vệ

– to filter (v) lọc

– ultraviolet light/ ray (n): ánh sáng, tia cực tim, tia tử ngoại

– depletion (n) sự suy yếu