| Whenever I hear a weather report
declaring it’s the hottest June l0 on record or whatever, I can’t take it too
seriously, because "ever" really means "as long as the records go back", which
is only as far as the late 1800s. Scientists have other ways of measuring
temperatures before that, though--not for individual dates, but they can ten the
average temperature of a given year by such proxy measurements as growth marks
in corals, deposits in ocean and lake sediments, and cores drilled into glacial
ice. They can even use drawings of glaciers as there were hundreds of years ago
compared with today. And in the most comprehensive compilation of such data to date, says a new report from the National Research Council, it looks pretty certain that the last few decades have been hotter than any comparable period in the last 400 years. That’s a blow to those who A. The tendency of earth’s becoming hotter. B. The assessment of earth’s temperature. C. The menace of global warming. D. The measurement of tackling global warming. 我来回答: 提交
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