题型:阅读理解 题类:模拟题 难易度:普通
北京市房山区2020届高三英语第一次模拟考试试卷
Benefits and Problems of Genetic Engineering
Plant breeding is the science of changing the characteristics of plants in order to produce desired ones. Genes in a plant are what determine what type of characteristics it will have. Plant breeders try to create a specific outcome of plants and potentially new plant varieties by changing the genes of the plants through breeding, which is making new plants from parents of different varieties or species.
Actually, plant breeding has been practiced for thousands of years, since near the beginning of human civilization. It is practiced worldwide by individuals such as gardeners and farmers and by professional plant breeders employed by organizations such as government institutions, universities, crop-specific industry associations or research centers. They have crossbred plants to create the new types of plants that are, for example, bigger, stronger, or more attractive.
Crossbreeding can take such a long time, however, and it is inaccurate. Now, we can change exact sections of Deoxyribonucleic acid (DNA), so the process is more accurate and faster. But people all over the world are arguing about its benefits and disadvantages. Some people use the technology to produce desired characteristics of plants and animals. Other people are concerned that the genetically engineered plants may harm the environment and worried that they may be dangerous for people to eat.
There are many reasons for changing plants in this way. International development agencies believe that breeding new crops is important for ensuring food security by developing new varieties that are higher yielding(高产的), disease resistant, drought tolerant or regionally adapted to different environments and growing conditions. For example, some genetically engineered plants can live through frost or draught. As a result, famers can make more profit because fewer plants will die.
Some genetically engineered plants are more nutritious. They have less fat, taste better or stay fresher than non-genetically engineered plants. This will allow people to buy better-quality fruit and vegetables.
Some genetically engineered plants can resist natural pests such as viruses or insects. This reduces the amount of chemical needed to kill pests, which is helpful to the environment.
However, genetically engineered plants can cause unexpected problems. Genetically engineered plants that resist pests may pass on that characteristic to a wild relative. This may cause the wild plant to spread fast, because pests are not naturally killing it.
Genetically engineered plants can also harm animals. A type of corn has been developed which kills a species of insect that destroys it. The pollen (花粉) from this corn, however, can also kill monarch butterflies—the most beautiful of all butterflies, which do not harm the corn.
To ensure the most adapted varieties are identified, advocates of organic breeding now promote the use of direct selection for many desired characteristics.
Genetic engineering is a very new science and we have a lot to learn about the good it can do and the damage it can cause. The main concern is that not enough tests are being done to ensure it is safe.
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There are many international organizations which work to save and protect endangered species (物种) and natural environment. If you would like more information about any of the organizations listed below, you can write to the addresses given.
Friends of the Earth (FOE) campaigns on a range of problems including rainforests, the countryside, water and air pollution and energy. Friends of the Earth International Secretariat P.O. Box 19 199 1000 G. D. Amsterdam The Netherlands | Greenpeace uses peaceful but direct action to defend the environment. It campaigns to protect rainforests and sea animals' slop global warming and end pollution of air, land and seas. It also opposes nuclear (核) power. Greenpeace International Keizergracht 176 1016 DW Amsterdam The Netherlands |
BirdLife International is an organization which works to save endangered birds all over the world. BirdLife International Wellbrook Court Girton Road Cambridge CB3 ONA | England WWF-World Wide Fund For Nature is the world's largest private international organization for the protection of nature and endangered species. Information Officer WWF International Avenue du Mont —Blanc 1196 Gland Switzerland |
By clicking the thumbs up, posting a comment, or sharing a post, people are validating(认可) each other at an increasing rate. This, as well as the need for in-person validation, can create anxiety, depression, and low self-esteem and make it addictive to hear praise, acceptance, and acknowledgment in all aspects of life.
To break free from external validation, it's key to learn to be aware when you are seeking it.{#blank#}1{#/blank#} Here are some meaningful steps to begin that journey.
{#blank#}2{#/blank#}Getting off social media is a great place to start. This reduces the comparison to others or the anxiety and stress about how your picture, post, or comment is being seen and received by others.
Be mindful. Look carefully at what you are doing.{#blank#}3{#/blank#}These are self-validations that help you build up your acknowledgment of your own abilities, talents, and skills.
Do not ask for validation. {#blank#}4{#/blank#} If you do receive validation (encouragement or acknowledgment) recognize the praise and acknowledge it, then stop. Do not continue to ask others or seek out others for validation.
Keep in mind that validation is not a bad thing in your life; it is positive without doubt. {#blank#}5{#/blank#}
A. Take a social media break. B. Ignore the need for praise and acceptance. C. It's only problematic when it's your single focus. D. Track and record improvements, mentally or on paper. E. Problems arise when self-validation is valued too much. F. Instead of seeking validation from others, ask yourself first. G. This self-awareness can lead to growth through internal validation. |
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