Acid rain, or acid precipitation, another man made get better grades disaster, occurs when sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere, undergo chemical transformations and are absorbed by water droplets in clouds. The term "acid rain" is used more generally to include all forms of acid deposition. That Acid rain is one of the most dangerous man-made disasters which forms environmental threats is a fact that makes each individual concerns about its stages, causes and effects.

　　The first stage of acid rain formation is produced when sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere. These fumes are produced by two different sources. The first source is called natural phenomenon which includes forests' fires and volcanoes. When volcanoes erupt they release sulfur dioxide (SO2) and nitrogen compounds. These can create what is called natural acid rain. Natural acid rain is as destructive as industrial created acid rain, but less common.

　　51. What’s the best title of the passage?

　　A. Man and Natural Disaster

　　B. Effects of Man Made Disasters on Environment

　　C. Environmental Protection

　　D. Man Made Natural Disaster: Acid Rain

　　52. What’s the meaning of the underlined word“catalyze”？

　　A. reduce

　　B. contribute

　　C. absorb

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