⑴鎘污染區施用石灰；

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五、土壤受重金屬污染後，常添加一些農用無害物質做為土壤改良劑（soil amendments），以降低作物對污染重金屬之吸收濃度。請說明下列物質添加後在該污染土壤之主要作用機制（mechanism）或反應（reaction）為何？

四、 Hydrocarbon fuels (chiefly coal, oil and natural gas) were first used to create energy at the dawn of the Industrial Revolution, as mankind began to run short of traditional fuels like wood and whale oil. The new fuels contained more latent energy than any previously discovered, but they also came with a flaw: the carbon emissions that are an unavoidable by-product of their combustion. These gases build up in the planet’s atmosphere, where they act like the panes of glass on a greenhouse, allowing the sun’s warmth in but not back out. As heat that would ordinarily radiate off into space is instead reflected once again toward the planet’s surface, temperatures begin to rise and the globe begins to warm. Two of the sharpest spears created by global warming — flooding and drought — account for more than half the world’s deaths from natural disaster. Nations whose land lies close to sea level, like the Netherlands, Bangladesh and Indonesia, are at great risk, as are locations where natural barriers against water have been degraded by man. Scientists believe that Hurricane Katrina would have packed a far less devastating punch if the wetlands that buffer New Orleans from the Gulf of Mexico had not been removed by imprudent levee-building and oil and gas development.

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⑴鎘污染區施用石灰；

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