問題詳情

請依下文回答第 11 題至第 15 題：To counter the lost fertility that comes with harvesting crops and land-tilling, farmers have relied on regularapplications of human-made fertilizers to maintain field productivity. Excessive application of fertilizers can, 11 ,further reduce natural soil fertility by introducing salts that kill microorganisms. Fertilizers can also provide an excessof nitrogen that stimulates populations of 12 bacteria to the point that too little organic matter is available to feedsoil bacteria, which then starve. Nitrogen leaching into lakes can lead to unnatural algal blooms that can consume all ofthe oxygen, 13 fish and plant life. When nitrogen contaminates domestic water wells, as has happened incommunities close to dairies and feedlots with inadequately controlled animal 14 , the “blue baby syndrome” canresult. Nitrates interfere with the oxygen-carrying ability of red blood cells and the effect can be especially serious forinfants. Most adults have an enzyme that converts the 15 red blood cells back to normal.
11
(A)paradoxically
(B)ironically
(C)) fruitfully
(D) amicably 

參考答案

答案：B
難度：困難0.324324
統計：A(117),B(156),C(110),D(44),E(0)

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