Questions 47 to 56 are based on the following
passage. Global warming refers to an increase in global
surface temperature resulting from an increase in the amount of carbon dioxide,
methane, and certain other trace gases in the atmosphere. These gases are
(47) known as greenhouse gases because they (48)
to the warming of the earth’s surface and lower atmosphere, a
phenomenon called the greenhouse effect. Partly because the (49)
of carbon dioxide is related to the essential use of the carbon based
energy sources, the (50) of global warming incorporates a
broad, scientific and political debate about its significance and
consequences. Today, as the results of the efforts of thousands
of scientists over several decades who have studied climate and its
(51) with the global land-ocean-atmosphere system, the
scientific understanding of global warming is both more clear and complex.
Scientists have obtained strong (52) that climate does
indeed change, on scales (53) from a few seasons to
millennia. Scientists have further shown that human activities can indeed
influence the climate. As a sign of change in the international
responses to global warming, delegates at a meeting under the Framework
Convention on Climate Change in 2002 in New Delhi issued a declaration
concluding that "Actions are required to (54) energy supply
by developing advanced, clearer, more efficient, affordable and cost-effective
energy technologies". No matter how the science and politics (55)
over the coming years, one fact remains (56) :
global warming presents a challenge that will be with us for decades and perhaps
centuries to come. A) irrefutable B)
contribute C) diversify
D)evolve E) irrelevance F)
collectively G) emission H)
issue I) claim J)
question K) interconnection L)
respectively M) evidence N) ranging
O) devote