Imagine your body is like the house you live in．Every day, your family creates rubbish．The rubbish builds up until it is put out for the weekly garbage collection．
Now, say you put three bags of garbage out, but because one of the collectors was away sick, only two bags are collected．You take the leftover bag inside to be put out again next week．The following week you put on another three bags, plus the leftover bag from last week．But again, only two bags are collected．Imagine this cycle is repeated over the following weeks．
This is a simple description of what happens to your body when your kidneys （肾脏）don't work efficiently．Your body is not thoroughly emptied of waste products．Other areas of the body such as blood pressure and red blood cell production are affected and the insidious process that may lead to kidney failure begins．
It's not unmon for people to lose up to 90% of their kidney function before developing any symptoms．There may be no warning signs. This makes early detection （诊查）difficult．
Kidney's main job is to remove toxins（毒素） and unwanted water from our blood．Every day our kidneys clean an average of 200 litres of blood．Kidney failure may be a gradual and silent process, going unnoticed because there is no obvious pain．
Research shows that more than 35% of the patients requiring dialysis（透析）do not see a kidney specialist before they have to do so．Some risk factors for kidney disease such as age and genetic make-up are out of our control; however, some changes in lifestyle may help prevent kidney damage．Two major risk factors for kidney disease, diabetes （糖尿病）and high blood pressure, have been on the rise over the last few decades．Both conditions are chiefly affected by being overweight and not getting enough exercises, which are the potential (潜在的) risk factors for the kidney disease．
【小题1】The author gives the example of the house we live in to indicate that ．A．it doesn't matter much if the waste in our body is not emptied in timeB．our body will not produce any waste if our kidneys work efficientlyC．it's important for our body to empty the waste in time every dayD．it's safe and harmless for our body to keep some waste【小题2】The underlined word “insidious” in Paragraph 3 means .A．smooth and safeB．apparent and fastC．gradual and unnoticedD．long and painful【小题3】We can infer that when we find some symptoms related to our kidneys, .A．the kidney failure beginsB．the kidneys can still work properlyC．we have lost about 10% of kidney functionD．the kidneys may have been seriously damaged【小题4】How many risk factors of kidney disease are mentioned in the passage?A．Six. B．Five.C．Four.D．Two.【小题5】Which of the following helps prevent kidney damage most effectively?A．Go to see a kidney specialist shortly before dialysis starts.B．Take enough exercise and make early detection of kidney disease.C．Try to keep low blood pressure and a stable lifestyle.D．Go to hospital whenever you find any warning signs.C
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(答案→)C
解析：本文讲述的是肾脏问题出现的原因以及巨大的危害，分析了肾脏问题出现的重要因素，提出了解决的方法。
【小题1】C 推理题。根据文章第二段Now, say you put three bags of garbage out, but because one of the collectors was away sick, only two bags are collected．You take the leftover bag inside to be put out again next week．The following week you put on another three bags, plus the leftover bag from last week．But again, only two bags are collected．Imagine this cycle is repeated over the following weeks．可知如果我们不及时清理体内的毒素，我们的身体会出很大的问题。故C项正确。
【小题2】C 推理题。根据本句Other areas of the body such as blood pressure and red blood cell production are affected and the insidious process that may lead to kidney failure begins可知这种破坏的过程是渐进的，慢慢的，会导致肾脏功能的衰竭。故该词是逐渐的，慢慢地。故C正确。
【小题3】D 推理题。根据文章第4段It's not unmon for people to lose up to 90% of their kidney function before developing any symptoms．There may be no warning signs. This makes early detection （诊查）difficult．可知百分之90的症状是看不出来的，也就是如果我们已经发现了，那么问题可能已经很严重了。故D正确。
【小题3】A 细节题。根据文章最后一段as age and genetic make-up are out of our control;和overweight and not getting enough exercises,以及diabetes （糖尿病）and high blood pressu可知文章中一共提及了6个因素。故A正确。
【小题5】B 推理题。肾脏在早期很难观察到，那么我们要尽早检查，经常检查。同时加强锻炼也是一个很重要的方法。故B正确。