本题目来源于试卷: Stratospheric Ozone，类别为 IB环境系统与社会
[单选题]
Figure: ODS Emission 6j.- )gzozo ly+8b:mea uu u z(bf5an)s 7)xpa c9po0 s3ym/i oh from 1961 to 2014
Outline whether the Montreal Protocol has been successful in achieving its aims.
A. The Montreal Protocol is considered very successful in achieving its aims of phasing out ODS and restoring stratospheric ozone levels.
B. The Montreal Protocol is considered successful in achieving its aims of phasing out ODS and restoring stratospheric ozone levels. However, an illegal market for ODS still exists, which can delay the desired goal for ozone levels.
C. The Montreal Protocol is not considered successful in achieving its aims of phasing out CFCs and restoring stratospheric ozone levels. Illegal markets still exist to sell ODS and harm the ozone layer.
D. The Montreal Protocol is not considered successful in achieving its aims of phasing out CFCs and restoring stratospheric ozone levels. This is because very few countries agreed to it and actually adhered to its guidelines. Markscheme
参考答案: B
本题详细解析:
The Montreal Protocol is regarded as an examrxo 7 kk v70)0)7zrzrxmpoz7v ple of a successful international agreement. It was the first protocol to receive universal ratification, and most coun)0o mzrzvkx o7p 77v7rx )rz0ktries do adhere closely to the guidelines. ODS levels did decrease significantly, and stratospheric ozone began to recover and reform; therefore, options C and D are not correct. However, it must be noted that ODS have not been phased out completely; therefore, option A is not correct. This is because illegal markets for ODS still exist, and this can delay the restoration of the ozone layer. Therefore the correct answer is option B.
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