A. They occurred naturally over a long period of time
B. They were partly intended.
C. They were wholly the result of human activity.
D. They were fully monitored by humans.
67. The word “alarmingly” in paragraph 2 is closest in meaning to ____.
A. disapprovingly B. disappointingly C. surprisingly D. worryingly
68. According to the passage, agriculture could ____.
A. make the global warming more serious
B. be indirectly affected by the global temperature rises
C. give rise to many ecological disasters
D. be directly damaged by the rises in global temperature
69. Greenhouse gases cause the warming up of the Earth because they ____.
A. are emitted by car engines B. trap heat from the sun
C. do not add to atmosphere pollution D. are unusual gases
70. According to the passage, 1997 witnessed ____.
A. the largest number of summits on the subject of climate change
B. the most important summit on climate change taking place in Kyoto, Japan
C. the highest attendance by representatives from 180 industrialized countries
D. widespread concern about climate change
71. It can be inferred from the passage that the countries which are mainly responsible for global warming are ____.
A. countries with the warmest climate B. developing countries
C. developed countries D. the most industrialized countries
72. The word “There” in paragraph 5 refers to ____.
A. the world’s industrialized countries B. regular summits on climate change
C. the most industrialized countries D. the 1997 summit in Kyoto, Japan
73. Which of the following is NOT true, according to the passage?
A. Carbon dioxide is one of the gases that may cause the so-called greenhouse effect.
B. The so-called sinks created by forests can absorb greenhouse gases.
C. The problem of rapid climate change has been caused mainly by deforestation.
D. Politicians are among those who are concerned about climate change.
74. The word “drastic” in paragraph 6 is closest in meaning to ____.
A. hard B. severe C. widespread D. obvious
75. What is probably the writer’s attitude toward global warning?
A. Optimistic B. Pessimistic C. Neutral D. Positive
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