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 uncommon 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 apparent pain.

Research shows that more than 25% 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 risk factors for the kidney disease.

1. The author gives the example of the house we live in to indicate that _______.

A. it’s safe and harmless for our body to keep some waste

B. it’s important for our body to empty the waste in time every day

C. our body will not produce any waste if our kidneys work efficiently

D. it doesn’t matter much if the waste in our body is not emptied in time

2.The underlined word “insidious” in the third paragraph means _______.

A. smooth and safe B. obvious and fast

C. gradual and unnoticed D. long and painful

3.We can infer that when we find some symptoms related to our kidneys, _______.

A. the kidney failure begins

B. the kidneys can still work properly

C. we have lost about 10% of kidney function

D. the kidneys may have been seriously damaged

4. 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.

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The extraordinary Eastgate Building in Harare, Zimbabwe’s capital city, is said to be the only one in the world to use the same cooling and heating principles as the termite mound(白蚁堆).

Architect Mick Pearce used precisely the same strategy when designing the Eastgate Building, which has no air-conditioning and almost no heating. The building—the country’s largest commercial and shopping complex—uses less than 10% of the energy of a conventional building of its size. The Eastgate’s owners saved $3.5 million on a $36 million building because an air-conditioning equipment didn’t have to be imported.

The complex is actually two buildings linked by bridges across a shady, glass-roofed atrium(天井) open to the air. Fans suck fresh air in from the atrium, blow it upstairs through hollow spaces under the floors and from there into each office through baseboard vents(通风口). As it rises and warms, it is drawn out via ceiling vents and finally exists through forty-eight brick chimneys.

During summer’s cool nights, big fans blow air through the building seven times an hour to cool the empty floors. By day, smaller fans blow two changes of air an hour through the building, to circulate the air which has been in contact with the cool floors. For winter days, there are small heaters in the vents.

This is all possible only because Harare is 1600 feet above sea level, has cloudless skies, little dampness and rapid temperature changes—days as warm as 31℃ commonly drop to 14℃ at night. “You couldn’t do this in New York, with its hot summers and cold winters,” Pearce said.

The engineering firm of Ove Arup & Partners monitors daily temperatures. It is found that the temperature of the building has generally stayed between 23℃ and 25℃, with the exception of the annual hot period just before the summer rains in October and three days in November, when a doorkeeper accidentally switched off the fans at night. And the air is fresh—far more so than in air-conditioned buildings, where up to 30% of the air is recycled.

1.Why was Eastgate cheaper to be built than a conventional building?

A. It was designed in a smaller size.

B. No air conditioners were fixed in.

C. Its heating system was less advanced.

D. It used rather different building materials.

2.What does “it” refer to in Paragraph 3?

A. Hollow space.

B. Baseboard vent.

C. Fresh air from outside.

D. Heat in the building.

3.Why would a building like Eastgate Not work efficiently in New York?

A. New York has less clear skies as Harare.

B. Its dampness affects the circulation of air.

C. New York covers a larger area than Harare.

D. Its temperature changes seasonally rather than daily.

4.The data in the last paragraph suggests Eastgate’s temperature control system_____.

A. works better in hot seasons

B. can recycle up to 30% of the air

C. functions well for most of the year

D. allows a wide range of temperatures

Knowing how much her own children loved presents at Christmas,Ann Sutton always tried to seek help for one or two poor families.With a social worker mother,the Sutton children.had inherited(继承)her commitment to service,and knew never to take their good fortune at Christmas for granted.This year,Kinzie,her seven-year-old daughter was thrilled that Santa Claus would make a special visit to a 22-year-old mother named Ashley who worked in a factory raising her 12-month-old son by herself.

The phone rang on Sunday.A representative from a local organization was calling to say that the aid Ann had requested for Ashley had fallen through.No Santa Claus,no presents,nothing.

Ann saw the cheer fade away from her children's faces at the news.Without a word,Kinzie ran into her bedroom.She returned,her face set with determination.

Opening up her piggy bank,she put all the coins onto the table: $3.30.Everything she had.

“Mom,”she told Ann,“I know it's not much.But maybe this will buy a present for the baby.”

At a breakfast meeting the next day,Ann told her coworkers about her daughter story.To her surprise,staff members began to open their purses.and empty their pockets to help Kinzie.

On Christmas Eve,Ann drove through the pouring rain to the small trailer where the Ashley’s lived.Then she began to unload the gifts from the car,handing them to Ashley one by one.

Ashley was very moved.Reflecting on a little girl's generosity,Ashley says she'll one day be able to do something similar for someone else in need.“Kinzie could have used that money for herself,but she gave it away,”Ashley says.“She's the type of kid I'd like my son to grow up to be.”

1.According to the text,Ann Sutton__________.

A.only cares about poor children

B.has possessed a good fortune

C.is warm-hearted and ready to help others

D.is a single mother with a 12-month-old boy'.

2.When hearing the aid had fallen through,Kinzie__________

A.was not sad but cheerfu1

B.put all her coins away immediately

C.told her mother to ask the coworkers for help

D.decided to buy a present for the baby with all her allowance

3.From the text we can learn that ____________.

A.Ann would act as Santa Claus to hand out the Christmas presents

B.the Sutton children always got lots of presents at Christmas

C.Kinzie's generosity influenced others and they clici something similar

D.Ashley was moved and promised to return the money

4.What does the text mainly talk about?

A.How a warm-hearted mother shows her love to a poor family.

B.How a mother and her young daughter helped a poor family.

C.Many people make contributions to those in need.

D.What happened to a poor family on Christmas Eve.

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