单项选择题

The Smog (烟雾)
For over a month, indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form. a cloud of smog. This pollution quickly spread and within days it was hanging over neighbouring countries including Malaysia, Singapore and ThailanD.
When the smoke combined with pollution from factories and cars, it soon became poisonous (有毒的). Dangerous amounts of CO became trapped under the smog and pollution levels rosE.People wheezed (喘息) and coughed as they left the house and their eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as grey soot (烟灰) covered everything. In some areas, water was hosed (用胶管浇)from high-rise city buildings to try and break up the smog.
Finally, heavy rains, which came in November, put out the fires and cleared the air.But the environmental costs and health problems will remain. Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes (汽车排放的废气)and factory pollution. Breathing problems could well increase and many non-sufferers may have difficulties for the first timE.Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem. In fact, the word was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital.Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4,000 Londoners died within five days as a result of thick smog in 1952.
第 16 题 Indonesia was in crisis because of the drought.
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单项选择题
Dark Forces Dominate UniverseThe earth, moon, sun and all visible stars in the sky make up less than one percent of the universe, .Almost all the rest is dark matter and dark energy, unknown forces that___________(51) astronomers.Observations in recent years have changed the basic___________ (52) of how the universe evolved and have indicated how little is known about the major forces and substances that___________(53) our worlD.Astronomers now know that luminous发光的) matter---stars, planets and hot gas--accounts___________ (54)only about 0.4 percent of the universE.Non-luminous components, such as black holes and intergalactic (星系间的) gas, ___________ (55)up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent.Dark matter, sometimes___________(56) 'cold dark matter,' has been known for some timE.Only recently have researchers come to understand the key role it___________(57) in the formation of stars, planets and even peoplE.'We ___________ (58) our very existence to dark matter,' said physicist Paul Steinhardt and a co-author of a review on dark matter which (59) not long ago in the journal SciencE.'Dark matter dominated the structure___________ (60) in the early universe,'Steinhardt saiD.'For the first few billion years dark matter contained most of the mass of the universE.You can think of ordinary matter ___________ (61) a froth (泡沫) of an ocean of dark matter. The dark matter clumps (结成块) and the ordinary matter falls into it.That___________ (52) to the formation of the stars and galaxies (星系.'Without dark matter, 'there would be virtually no structures in the universE.'The nature of dark matter is___________ (63). It cannot be seen or detected directly.Astronomers know it is there because of its___________ (64) on celestial (天体的)objects that can be seen and measureD.But the most dominating force of all in the universe is called dark energy, a recently ___________ (65) power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speeD.第 51 题A.worryB.moveC.puzzleD.reject
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