专八_改错_练习15篇带答案解析
Error-correction Exercise 16
NASA is about to launch a large satellite that will monitor
the health of Earth's atmosphere in unprecedented detail, and 1____________ keeping daily track of everything from the upper ozone layer,
that guards against solar radiation, to the air near the 2____________ ground that people breathe. The $785 million mission
is to be launched Saturday from Vandenberg Air Force Base
in California. A Boeing Delta II rocket will send the 6,542-pound
spacecraft into a 438-mile-high polar orbit. That is to scan the 3____________ atmosphere for at least six years.
The craft, naming Aura, is the third and final addition to a series 4____________ of major satellites making up NASA's Earth Observing System,
an initial set of spacecraft that designed to study all of the processes 5____________ that affect the Earth's climate and weather. Terra, which monitors
land-based processes, was launched in 1999; Aqua, which observes
the oceans and water cycle of Earth, sent up in 2002. These flagship 6____________ spacecrafts, joined by more than a dozen of other satellites launched by 7____________ the United States and several other nations, allow long-term studies
of the factors that influence climate change, using many different
instruments. The launching is fundamentally a mission to understand
and protect the very air we breathe. In conjunction with the 8____________ climate observatories, Aura should make a major contribution to
determine the causes, extent and consequences of global change. 9____________ The spacecraft carries four instruments that will survey the
atmosphere from top to bottom, including monitoring ozone
in its good and bad forms. In the upper atmosphere, ozone in the
stratosphere provides a protective barrier for harmful ultraviolet 10___________ radiation from the Sun. In the troposphere, the atmospheric layer
that goes from the ground up to about six miles, ozone produced
by combustion is a major pollutant in smog.
Error-correction Exercise 17
Mars has provoked much speculation on the possibilities 1___________ of life on Earth than any other planet in the Solar System. 2___________ The presence of water is a prerequisite for
existing of life. Therefore, “follow the water” has 3___________ been NASA’s chief guideline for the exploration of 4___________ a red planet. Although Mars experiences seasons like
on Earth an has polar caps which composed of 5___________ carbon dioxide and water ice, today it is bone-dry and
frigidly cold. But evidence is rapidly accumulating that
Mars is once much wetter, with a more clement climate. 6___________
This evidence comes from orbiting satellites and from
data collected by roving landers.
Since the 1970’s, space probes of Mars have revealed 7___________ numerous features apparent carved by flowing water, 8___________ such as winding, branched valleys resembling
driedout streambeds and giant outflow channels gouged
by catastrophic floods. Recent high-resolution imagery
from the Mars Global Surveyor, Mars Orbiter Camera
and the Mars Odyssey Themis reveal numerous examples 9___________ of branched valleys that form tightly-packed integrated
drainage system. There channels origins at topographic
high points; the valleys widen “downstream”, some
even displaying inner valleys. The valley networks
exhibit morph metric characteristics, including networks
densities, comparative to those of terrestrial drainage basins. 10__________ These features were most likely produced by rainfall, during
wetter, warmer periods in the past.
Error-correction Exercise 18comparisons
The word petroleum has its root in the Latin word oleum, 1___________ which means oil, and the Greek word petra, which means rock..
The word petrified shares with the same Greek root. As the 2___________ price of oleum has soared up, the links between fear and petroleum 3___________ have become clear to economists as well as etymologists.
Fears of heating-oil shortage this winter helped to push the
benchmark price of crude over $55 per barrel, a new record, on
Monday October 18th. The spike in oil prices, up by over
60% since the start of the year, is by turn, raising fears for the 4___________ global recovery. Even oil exporters are worried. The high prices

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