질문

문제 이해
A02 *
2015(7월)/교육청 24
다음 글의 밑줄 친 부분 중, 어법상 틀린 것은? [2점]
Not many years ago, schoolchildren were taught
that carbon dioxide is the ① naturally occurring
lifeblood of plants, just as oxygen is ours. Today,
children are more likely to think of carbon dioxide
as a poison. That's because the amount of carbon
dioxide in the atmosphere ② has increased
substantially over the past one hundred years, from
about 280 parts per million to 380. But what people
don't know is that the carbon dioxide level some 80
million years ago—back when our mammalian
ancestors were evolving—③ to be at least 1,000
parts per million. In fact, that is the concentration of
carbon dioxide you regularly breathe if you work
in a new energy-efficient office building, for ④ that
is the level established by the engineering group
that sets standards for heating and ventilation
systems. So not only ⑤ is carbon dioxide plainly
not poisonous, but change □□□□□
□□□□□
trigger for global warming historically.
풀이
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유사 문제와 풀이
4