题型:任务型阅读 题类:常考题 难易度:普通
北京市朝阳区2019届高三上学期英语期中考试试卷
Gardening 380 Kilometers above Earth
Astronauts have to go through physical, psychological, and technical training. They also go through training in how to care for plants. These “astronaut gardeners” share their work and living space with plants.
Taking seeds and plants along on a trip isn't a new idea. As space trips become longer, it will be necessary to grow food in space. Because of this, it's not practical to send everything needed for a long journey, only to be used once and thrown away.
Plants can serve many uses on a space journey. They can provide more fresh things. Also, plants can help to make air quality better because they produce oxygen. They can improve the quality of the air inside the spacecraft—the only air the astronauts can breathe.
Due to the lack of gravity in space, the oxygen that the plants produce stays around the plants. This can actually kill them, so fans are needed to circulate the air. Without gravity, roots don't “know” to grow down, leaves don't “know” to grow up, and water doesn't easily travel up the roots to the leaves. Besides, soil is too heavy to send to space, and special liquid gels (胶) are used to help plant growth.
Scientists are also working on the plants themselves. They are trying to make plants grow more rapidly and grow with less water and light in space, and they are looking for ways to make plants more resistant to disease. Imagine that deserts may one day provide lots of fresh food for local people, saving transportation costs. Similarly, plants that are resistant to disease could provide an important food supply. With the world's population now at seven billion (十亿) people, our astronaut gardeners may help discover ways to feed those billions.
A. Every plant grown in space must have several uses.
B. However, there are challenges with growing plants in space.
C. Such methods may result in improvements back here on Earth.
D. The cost of taking anything into space is about $22,000 per kilogram.
E. Specialized containers are being developed to help the plants grow correctly.
F. Astronauts will welcome the addition of fruits and vegetables to their diet of dry foods.
G. Currently all oxygen is taken aboard in tanks and then caught again so it can be reused.
A. Focus on your study B. Prepare your study area C. Put your timetable aside if it doesn't work D. When it comes to sleep, seven to nine hours is suggested E. If you're feeling a bit tired try getting outside for some fresh air F. It'll help you know where to start and what you're aiming to achieve for the day G. Get ready and use your time well with our expert advice on how to study for exams |
HSC, mid-terms, finals, no matter how you describe them, exams have something in common—including how to study well. {#blank#}1{#/blank#}
Plan a study timetable
Make sure you will cover your material in time with a realistic study timetable. {#blank#}2{#/blank#}. With a plan in place, you'll be less likely to put off your work as knowing how you will use your time will also mean you make best use of it.
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Give yourself the best environment by choosing somewhere with enough light, a comfortable chair, and little to no distractions. Sit down with all that you need — and only the things you'll need — like any books, notes or pens, as well as some water and healthy snacks on hand. Also ask what you don't need. A rule of thumb is if it doesn't help you study, it shouldn't be on your desk. It may look so simple but is really effective to help you focus on your study.
Keep healthy: sleep, eat and move
When exams come around somehow there never seems enough time for the basic things like sleep and exercise. Taking care of your health and wellbeing will really help you study at your best by improving your memory, mood and energy levels, and keeping those stress levels down. {#blank#}4{#/blank#}. Eating three meals and sticking to healthy snacks throughout the day will give you the energy you need to focus. {#blank#}5{#/blank#} A good aim is 20-30 minutes of exercise but even a walk nearby during study breaks will do you good!
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