2. 外语
  3. Scientists claim that air pollution causes a decline in the world’s average air temperature. In order to prove that theo- ry, ec

Scientists claim that air pollution causes a decline in the world’s average air temperature. In order to prove that theo- ry, ec

admin2010-02-20  42
问题    Scientists claim that air pollution causes
a decline in the world’s average air
temperature. In order to prove that theo-
ry, ecologists have turned to historic data                            【M1】 _______.
in relation to especially huge volcanic
eruptions. They suspect that volcanoes ef-
fect weather changes that are similar with                             【M2】 _______.
air pollution.
   One source of information is the affect of                          【M3】 _______.
the eruption of Tambora, a volcano in
Sumbawa, the Dutch East Indies, in April
1815. The largest recorded volcanic eruption,
Tambora threw 150 million tons of fine ash
into the stratosphere. The ash from a volcano
spreads worldwide in a few days and remain                             【M4】 _______.
in the air for years. Its effect is to turn
incoming solar radiation into space and
however cool the earth. For example,                                   【M5】 _______.
records of weather in England show between
April and November 1815, the average
temperature has fallen 4.5 F. During the                               【M6】 _______.
next 24 months, England suffered one of
the cold periods of its history. Farmer’s                             【M7】 _______.
records from April 1815 to December 1818
indicate frost throughout the spring and
summer and sharp decreases in crop and
livestock markets. Since there was a time
lag of several years between reason and                                【M8】 _______.
effect, by the time the world agricultural
commodity community has deteriorated,
no one realized the cause.
    Ecologists today warn that we face with                           【M9】 _______.
a twofold men-ace. The even-present
possibility of volcanic corruptions, such
as that of Mt. St. Helens in Washington,
added to man’s pollution of the atmosphere
with oil, gas, coal, and other pollut-
ing substances, may bring us increasing                              【M10】 _______.
colder weather.
【M6】
选项
答案has改成had。
解析 根据上下文意义，此处交代的是1815年的情况，因此过去时较合适。
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