关于水环境容量，下列说法错误的是（）。
A.对于特定的水体而言，根据水的不同用途，允许存在于水体的污染物量是不同的
B.针对不同的污染物有不同的水环境容量
C.水环境容量的大小与水体特征、水质目标及污染物特征有关
D.自然参数决定着水体对污染物的扩散稀释能力和自净能力，从而决定着水环境容量的大小，因此水环境容量只是自然规律参数的函数
参考答案：D
解析：水质标准的建立与水质目标的确定均带有明显的社会性，因此水环境容量也是社会效益的函数。
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| A serious car crash leads one woman to rediscover her faith in human kindness. In March last year, the car I was driving was_1_in a serious crash with another car on a country road. I soon_2_myself at the centre of a frenzy of activity, surrounded by paramedics, police, rescuers and members of the local community. An enormous can opener was used to 3 me out of my wrecked car and 4 an ambulance. Over the next eight hours, I was transported to hospital, dragged up, Xrayed and diagnosed (诊断) with a broken neck. Knowing that I'd 5 death by a fraction of a second sustained me throughout the long wait in the emergency ward and 6 me to deal with the visible distress of my hospital visitors. Only after I'd convinced the last friend to 7 could I direct my energies inwards. Flitting in and out of my line of vision during my hospital 8 was the Red Cross lady, a gentle 9 in white who, from time to time, popped her head in to 10 cups of tea. After the visitors had gone, she ventured further into my cubicle to 11 if I was all right. I found myself 12 her everything: about the shock of the 13 , my feats for my family as a result of my injuries-about my whole life. While I 14 for an ambulance to transport me to another hospital, she stood by my trolley and 15 my hand as I offloaded all the emotion I'd stoically withheld (强忍着的) from my family. She 16 , quiet and nonjudgmental. Even now, the 17 that I have her contact details provides me with great 18 . I look forward to a day in the nottoodistant future when my guardian angel and I can meet again, in 19 circumstances. In times of crisis, faith can sustain us: for me, my faith in human nature, reawakened by the 20 of a stranger, has helped ease my journey back to recovery. | ||||
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