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  3. Which of the following statements is true of "Earth’s Ozone Layer"? [originaltex

Which of the following statements is true of "Earth’s Ozone Layer"? [originaltex

游客2025-01-18  31
问题 Which of the following statements is true of "Earth’s Ozone Layer"?
JB: After 30 years of steady decline, Earth’s ozone layer is thinner but seems to be stable. A ban on ozone-depleting CFCs is largely responsible. Computer modeling gives reason to hope for an almost full recovery of Earth’s ozone layer within 60 years. But this sort of modeling is difficult -- and its predictions aren’t iron-clad.
DB: And some models show the ozone layer could face a new threat -- from global warming. Drew Shindell, an atmospheric scientist at NASA’s Goddard Institute for Space Studies in New York City, talked with us about his computer models of climate.
选项 A、Earth’s ozone layer is thinner and doesn’t seem to be stable.
B、The largely responsible part lies on a ban on ozone-depleting CFCs, when the Earth’s ozone layer seems to be stable.
C、Earth’s ozone layer will realize its’ full recovery within 60 years.
D、Some computer models show the ozone layer far from the threat of global warming.
答案 B
解析 本题的难点在于要从众多的信息要点中挑出正确的要点，挑战考生的记忆和理解能力。此外，本文中对“iron-clad”的理解可以参照“and”前面的“difficult”，通过结构确定其含义。对于这类题，一般用排除法和逻辑推理法，在理解的基础上选择正确的答案，本题选择b。
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