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2 năm trước
According to the passage, all of the following are true about Jupiter EXCEPT______
A.there are four planets closer to the sun
B.it is 14,000 kilometers wide
C.there is still much to be learned about the Great Red Spot
D.Pioneer and Voyager have added to our knowledge of Jupiter
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Các câu hỏi liên quan

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.
            These days, most people in Britain and the US do not (8) _____ very formal clothes. But sometimes it is important to wear the right thing.
            Many British people don't think (9) _____ clothes very much. They just like to be comfortable. When they go out to enjoy themselves, they can wear almost anything. At theatres, cinemas and concerts you can put on (10) _____ you like from elegant suits and dresses to jeans and sweaters. Anything goes, as long as you (11) _____ clean and tidy.
            But in Britain, as well as in the US, men in offices usually wear suits and ties, and women wear dresses or skirts (not trousers). Doctors, lawyers and business people wear quite formal clothes. And in (12) _____ hotels and restaurants men have to wear ties and women wear smart dresses.
(12)
A.one               
B.little                           
C.some                  
D.a

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
Stone statues and buildings that have stood in place for long periods of time have endured years of wind and weather, the effects of which are clearly visible in their outward appearances. Corners lose their sharp angles and features seem to crumble away. The natural process that breaks down rocks and stone is called chemical weathering. In the natural course of things, this type of disintegration is to be expected. When human use of fossil fuels is introduced into this equation, however, the process of chemical weathering is significantly affected.
In nature, water and acids act as primary agents in chemical weathering. Water, whether in the form of rivers or precipitation, plays a major part in the erosion of rocks and stone formations as they are weathered. "Dissolution" is the term scientists use for the process through which minerals are dissolved in water. For example, sodium chloride, or salt, quickly dissipates in water. However, most minerals will not dissolve in pure water alone. They must have at least one other substance present in order to initiate decomposition. When even a small amount of acid is added to water, its corrosive power is magnified. Acid can be produced by natural means such as when organisms decay and release organic acids back into the soil. Sulfide minerals such as pyrite release sulfuric acid into the atmosphere as they decay. These acids are absorbed into water and cause corrosion in many rocks. Additionally, when carbon dioxide from the atmosphere dissolves into raindrops, carbonic acid is created. As rain and snow fall on stone over time, they wear down the layers of sediment that make up the rock. Yet while many of these acidic reactions are to be expected in nature, the introduction of man-made byproducts has disrupted this natural cycle by hastening it along.
Man's use of fossil fuels in factories, power plants, and vehicles has greatly increased the amount of carbon dioxide, sulfur, and nitrous oxides in the atmosphere. This has led to an excessive amount of acid being produced and absorbed by different forms of water in the atmosphere, Scientists point to acid precipitation, rain with abnormally high levels of acid, as the culprit for the premature corrosion of stone statues and buildings. Whereas the natural chemical weathering process caused by the carbonic acid in rain would wear away rocks slowly over time, now the rocks decay at a more rapid pace. The acids that are not absorbed into rain or snow are often absorbed into the ground, seeping into ground water and affecting rocks and stones in river beds and lakes.
The process of decay and corrosion that rocks and stone structures undergo is a natural one that should take place over many years. Rainfall over time causes erosion and changes in the rock. Humans, however, have brought about changes in this process, increasing the speed at which stones are weathered by releasing more acid-producing compounds into the atmosphere. The effect is that buildings and monuments of stone that have stood for generations are experiencing swift decay.
According to the passage, which of the following is NOT true about the process of chemical weathering?
A.Man does not play a part in how rocks weather.
B.Natural acid production assists in the process.
C.Stones are slowly worn away over many years.
D.Acid often contaminates groundwater.

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