题型:阅读理解 题类:常考题 难易度:普通
黑龙江省双鸭山市第一中学2020届高三上学期英语第一次月考试卷
China became the first country to clone a monkey using non-reproductive cells, reducing the need to keep lab monkeys and paving the way for more accurate, effective, and affordable animal tests for new drugs.
By December of 2017, Chinese scientists had created two clone macaques named "Zhong Zhong" and "Hua Hua" by nuclear transferring of somatic cells -- any cell in the organism other than reproductive cells. This was the similar technology used to create the famous clone sheep Dolly in 1996.
Tetra, a rhesus monkey born in 1999, is the world's first ever-cloned monkey, but it was done using a simpler method called embryo splitting, but it could only generate four cloned offspring at a time and cannot be genetically modified to suit experimental needs, said Pu Muming, an academician at the Chinese Academy of Sciences and the director of Institute of Neuroscience, CAS. "Cloning a monkey using somatic cells has been a world-class challenge because it is a primate(灵长类)that shares its genetic makeup, therefore all of its complexity, with humans." Pu Muming said.
"For drug and other lab tests, scientists have to purchase monkeys from all over the world, which is costly, bad for the environment and produces inaccurate results because each monkey might have different genes," Pu said. "By cloning monkeys using somatic cells, we can mass produce large numbers of genetically same offspring in a short time, and even change their genes to suit our needs," he added. "This can save time, cut down experiment costs, and produce more accurate results, leading to more effective medicine."
Sun Qiang, director of the non-human primate research facility at the institute, said most of the drug trials are currently done on lab mice. However, drugs that work on mice might not work or even have severe side effects on humans because the two species are so different. "Monkeys and Humans are both primates, so they are much closely related and testing on Monkeys is supposed to be as effective as testing on humans," he said. This is especially useful in testing drugs for neural diseases such as Parkinson's disease, metabolic and immune system disease, and tumor, he added. "This achievement will help China lead the world research in an international science project related to neural(神经的)mapping of primate brains,"he said. However, bio labs from the United States, Japan, and European countries are also very able, and they will quickly catch up to China after the monkey cloning technology is made public, Sun added." This means we have to innovate continuously and work extra harder this year to stay ahead," he said.
Is Fresh Air Really Good for You?
We all grew up hearing people tell us to "go out and get some fresh air". {#blank#}1{#/blank#}According to recent studies, the answer is a big YES, if the air quality in your camping area is good.
{#blank#}2{#/blank#}If the air you're breathing is clean—which it would be if you're away from the smog of cities—then the air is filled with life-giving, energising oxygen. If you exercise out of doors, your body will learn to breathe more deeply, allowing even more oxygen to get to your muscles (肌肉) and your brain.
Recently, people have begun studying the connection between the natural world and healing (治愈). {#blank#}3{#/blank#}In these places, patients can go to be near nature during their recovery. It turns out that just looking at green, growing things can reduce stress, lower blood pressure and put people into a better mood (情绪). Greenery is good for us. Hospital patients who see tree branches out their window are likely to recover at a faster rate than patients who see buildings or sky instead. {#blank#}4{#/blank#}It gives us a great feeling of peace.
{#blank#}5{#/blank#}While the sun's rays can age and harm our skin, they also help us make up beneficial vitamin D. To make sure you get enough vitamin D—but still protect your skin—put on sunscreen right as you head outside. It takes sunscreen about fifteen minutes to start working, and that's plenty of time for your skin to absorb a day's worth of vitamin D.
A. Fresh air cleans our lungs. B. So what are you waiting for? C. Being in nature refreshes us. D. Another side benefit of getting fresh air is sunlight. E. But is fresh air really as good for you as your mother always said? F. Just as importantly, we tend to associate fresh air with health care. G. All across the country, recovery centres have begun building Healing Gardens. |
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