Sixty years after humans first conquered Mount Qomolangma,known as Mount Everest in the West,the rubbish and human waste left by climbers is turning the world's highest peak into the "world's highest junkyard” .

   Every year,more than 700 climbers and guides spend nearly two months on Mount Qomolangma's slopes each climbing season. They have left tons of rubbish including oxygen bottles,broken tents,ladders and wrappers,according to Ang Tshering Sherpa,chief of the Nepal Mountaineering Association.

    What's worse is that the human waste they’ve left because of the lack (缺乏) of toilets on the mountain. M Climbers usually dig holes in the snow and leave the human waste there,1' Sherpa said. "When washed down by glaciers (when the snow melts) , the human waste comes out in the open." The waste has been " piling up" for years around climbing camps,giving off an " unpleasant smell" . It has also become a health threat to people in the area since they depend on water from rivers fed by the melting glaciers,Sherpa said.

     Since 2008,Nepal has supported Eco Everest expeditions to clean the mountain each year. So far the cleaners have brought down 15 ,000 kg of trash,but they don't know how much is still left behind. Nepal has not yet come up with a plan to deal with the human waste. In 2014 the government made new rules,asking each climber to bring down 8 kg of trash — the amount a climber is expected to throw away along the route.

On the Chinese side of the mountain,the local government of Tibet is hoping to collect cleaning fees from climbers starting from this year. Chinese environmentalists have also been clearing up the mountain every year with a program called " Mount Qomolangma Action at the Third Pole of the Earth" since 2004. mf 11. What did climbers leave to turn Mount Qomolangma into the ” world's highest junkyard” ?

They left on Mount Qomolangma.

72. How long is Mount Qomolangma's climbing season?

For .

73. Why do climbers dig holes in the snow and leave the human waste there?

Because there aren’t on the mountain.

74. What does the underlined sentence M a health threat to people” here mean?

It means the rivers that people depend on already.

75. How many countries are trying hard to keep the peak clean according to the passage?


comfortable,   study,   other,   exact,   time,   breathe,  change,  little,   find,  healthy 

   When we exercise hard,we bum fat. But have you ever wondered where the fat 61. goes?

Some doctors think that fat is 62. into heat and released in the air. 63. think the body burns it.

Some even joke that the fat fairy comes and takes it. That's why you always weigh 64. in the morning.

Now a new study from the University of New South Wales in Australia reveals the mystery.

   "The correct answer is that most of the mass is breathed out as carbon dioxide. It goes into thin air," the 65. lead author,Ruben Meerman,said to Science Daily .

Scientists followed the atoms in 10 kilograms of fat as they were lost. They 66. that 8. 4 of those kilograms were breathed out as carbon dioxide through the lungs. The rest of the weight — 1. 6 kilograms — became water that left the body in the form of fluids such as urine (尿) ,sweat,67. and tears.

    " None of this is obvious to people because we can't see the carbon dioxide gas we breathe out," said Meerman.

Does that mean you can lose more weight by breathing more? It is not as easy as you think. Breathing more than the body9s metabolic rate (新陈代谢速度) can make you 68. . You may feel dizzy and become unconscious,according to the study.

   So how to lose weight 69. ? The key is to eat less and move more. You may have heard this many 70. .

During a day,a 70 kg person breathes out about 200 g of carbon dioxide. So if the same person wants to lose weight,he or she can do some light exercise,for example,jogging. This can help lose 240 g of carbon dioxide.

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