阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

    Sometimes, the word “green” means young, fresh and growing. For example, a greenhorn is someone who has no experience. In the 15th century, a greenhorn was a young cow or an ox whose horns(角)had not yet developed. A century later, a greenhorn was a soldier who had no experience in war. By the 18th century, a greenhorn had the meaning it has today—a person who is new in a job.

    Someone who is good at growing plants is said to have a green thumb(大拇指). The expression comes from the early 20th century. A person with a green thumb can make plants grow quickly and well.

    Green is also the color used to describe the powerful feeling , jealousy(嫉妒). The green-eyed monster （怪物）is not a dangerous animal from outer space. It is an expression used about 400 years ago by the British writer William Shakespeare in his play “Othello”. It describes the unpleasant feeling when someone has something he wants. For example, a young man may suffer from the green-eyed monster if you get a pay rise and he does not.

    In most places in the world, a green light means to move ahead. In everyday speech, a green light means agree to continue with a project.

    The carrier rocket sent a Shenzhou-ll spacecraft（航天器）with astronauts Chen Dong and Jing  Haipeng into space. The rocket was fired from the Jiuquan Satellite Launch Center{#blank#}1{#/blank#}the Gobi desert. After two days in Earth's orbit, the spacecraft{#blank#}2{#/blank#}(be) to link up with China's space  laboratory, called the Tiankong-2,{#blank#}3{#/blank#}name means“Heavenly Palace 2". The lab {#blank#}4{#/blank#} (place) into orbit last month.

    The astronauts will spend 30 days on the Tiankong-2. They plan to perform {#blank#}5{#/blank#} (science) and spacecraft-related experiments and test systems for a future space station. In{#blank#}6{#/blank#}words, the Tiankong

    2 laboratory will not be part of that space station. Its main goal is to practice the techniques and the{#blank#}7{#/blank#}(technology) that they will be {#blank#}8{#/blank#}(use)to build and operate that final space station.

    It is predicted that the Chinese space station will be built mostly by machine. China hopes to have the space station{#blank#}9{#/blank#} (complete) by 2022 and it is expected to operate for at least 10 years.

    China also plans to land a probe（探测器）on Mars by 2020. Until now, China has completed a total of five manned space missions. And, in 2003,it {#blank#}10{#/blank#} (successful)landed a probe on the moon.

                                                                                      The Lifecycle of a T-shirt

    We all probably have a lot of T-shirts, but do you ever stop and think about the influence of a T-shirt on the planet? You'd probably be surprised to learn what's involved in the lifecycle of just one T-shirt.

    There are 5 major stages: material, production, shipping, use and disposal. The material stage involves farming, irrigating, fertilizing, harvesting and ginning. While cotton is a natural fiber (纤维) and not as harmful to the environment as manmade fibers, it still takes a toll in the material and production stages. Commercial cotton farming uses a large amount of water, and the use of pesticides (杀虫剂) is widespread across the globe, especially in cotton farming. Studies have shown that farmers spend around $4.1 billion on pesticides annually, of which 25% was spent on cotton crops in the US.

    Once the cotton is grown and harvested, so begins the production stage: spinning, knitting, bleaching, dyeing, cutting, sewing, etc.——these processes also use a great deal of water and energy. Commercial dyes and bleaches are harmful pollutants and can eventually pollute groundwater.

    After the T-shirt is produced, it enters the transportation stage. This often involves overseas shipping. Take a look in your closet. Chances are that most of your cotton garments (衣服) are made in China or India. Garments can be shipped via plane, ship or truck…, all of which spill CO₂ into the atmosphere. Calculations show that CO₂ emissions from light trucks alone amount to 1.15 pounds per mile.

    Once the T-shirt reaches the retail market, it is purchased. This stage may seem like the leastenvironmentally damaging part. But consider the number of times you've washed and dried your favorite T-shirt. Washing machines are certainly becoming more efficient. However, the average American household does 400 loads of laundry per year, using about 40 gallons of water per load. Such excessive water use is combined with the large amount of energy used by dryers.

    The final stage of life is disposal. This releases harmful emissions, or involves a landfill where cotton takes years to break down. Current US records show that an estimated 15% of clothes and shoes are recycled, which means that consumers send a shocking 85% of these materials to landfills.

    We all need new clothes every once in a while, but let's all try to keep in mind what goes into the production of clothing... It has a real impact on the planet.

    There are a lot of things you can do to help reduce your impact. Reuse and recycle clothes. If they're too worn out to wear, cut them up and use them as cleaning rags. Donate them to charity or another organization that recycles textiles. When possible, make an effort to buy organic cotton. Turn down the thermostat on your washer, and line dry your clothes when the weather will allow it.

                                                                      Amazon Best Sellers: Best Books

    A Higher Loyalty: Truth, Lies, and Leadership-April 17, 2018by James Comey

    In his book, former FBI director James Comey shares his never-before-told experiences from some of the highest-risk situations of his career in the past two decades of American government, exploring what good, ethical（道德的）leadership looks like, and how it drives sound decisions. His journey provides an entry into the corridors of power, and a remarkable lesson in what makes an effective leader.

    Hardcover $17.99

    12 Rules for Life: An Antidote to Chaos- January 23, 2018 by Jordan B. Peterson

    What does everyone in the modern world need to know? Famous psychologist Jordan B. Peterson's answer to this most difficult of questions uniquely combines the hard-won truths of ancient tradition with the great findings of most-advanced scientific research.

    Hardcover $15.57

    How to Read a Book: The Classic Guide to Intelligent Reading Revised Edition by Mortimer J. Adler, Charles Van Doren

    With half a million copies in print, How to Read a Book is the best and most successful guide to reading comprehension for the general reader, completely rewritten and updated with new material. Originally published in 1940, this book is a rare phenomenon, a living classic that introduces and clarifies the various levels of reading and how to achieve them-from elementary reading, through systematic skimming and inspectional reading, to speed reading.

     Paperback $10.31

    Everybody, Always: Becoming Love in a World Full of Setbacks and Difficult People- April 17, 2018 by Bob Goff

    Paperback $10.19

    What happens when we stop avoiding difficult people and simply love everyone? In his wildly entertaining and inspiring follow-up to the New York Times bestselling phenomenon Love Does, Bob Goff takes readers on a life-altering journey into the secret of living without fear, care, restriction, or worry.

Yawning（哈欠）sends out certain messages—either “Oh, this movie is boring" or "I probably need to get some sleep". But did you know that a yawn can also help your brain to cool down when it is so overheated?

    A new study, led by a research team of Princeton University, has indicated（表明）that yawning could be the brain's natural way of regulating temperature. People yawn more often when the temperature outdoors is lower than their body temperature but are less likely to yawn when it is hotter outdoors, according to Sciencedaily.com.

    The research team did an experiment on 160 people, 80 in summer and 80 in winter, to examine how often they yawned at different air temperatures. The study found that people yawned more often in winter than in summer. Scientists say that when the air temperature is lower outside the body, there is heat exchange between the overheated brain and the cool air. But when the air temperature is higher than or equal to the body, people are less likely to yawn because the hot air they breathe in will make the brain even hotter.

    When people yawn, their jaw is also stretched, which increases blood flow and may also help cool the brain.

    The study showed that the amount someone yawned could be related to the amount of time they spent outside. The longer they spent outside in summer, the less they yawn. Nearly 40 percent of participants yawned within their first five minutes outside, but after that the percentage was reduced to less than 10 percent.

    However, the result was the opposite in winter. The number of people who yawned increased when they spent more than five minutes outdoors. But the change was only slight compared to summertime.

    According to Gallup, this is the first report to show that yawning frequencies(频率) change depending on season. This could help us to understand better the way our brains work. It may also help us understand the reason why frequent yawning can sometimes be a sign of brain disease.

    The values of artistic works, according to cultural relativism (相对主义), are simply reflections of local and economic conditions. Such a view, however, fails to explain the ability of some works of art to excite the human mind across cultures and through centuries.

    History has witnessed the endless production of Shakespearean plays in every major language of the world. It is never rare to find that Mozart packs Japanese concert hall, as Japanese painter Hiroshige does Paris galleries. Unique works of this kind are different from today's popular art, even if they began as works of popular art. They have set themselves apart in their timeless appeal and will probably be enjoyed for centuries into the future.

    In a 1757 essay, the philosopher David Hume argued that because “the general principles of tastes are uniform (不变的) in human nature,” the value of some works of art might be essentially permanent. He observed that Homer was still admired after 2000 years. Works of this type, he believed, spoke to deep and unvarying features of human nature and could continue to exist over centuries.

    Now researchers are applying scientific methods to the study of the universality of art. For example, evolutionary psychology is being used by literary scholars to explain the long-lasting themes and plot devices in fiction. The structures of musical pieces are now open to experimental analysis as never before. Research findings seem to indicate that the creation by a great artist is as permanent an achievement as the discovery by a great scientist.