[外语类试卷]大学英语六级改革适用(听力)模拟试卷123及答案与解析.doc
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1、大学英语六级改革适用(听力)模拟试卷 123及答案与解析 Section C 0 Rainforests are critically important to our well-being. Because they【 B1】 _ carbon dioxide, a greenhouse gas, and produce oxygen. They are sometimes called the【 B2】 _of the planet. Despite the fact that rainforests cover only 12 percent of the land-area of th
2、e Earth, they are home to between 50 and 90 percent of the worlds plant and animal species, and for local populations they are a【 B3】 _source for food, fiber, fuel and medicines. Tropical forests regulate global and regional climate-systems, and release【 B4】 _into the atmosphere, which then returns
3、to earth in the form of rain. But where the land has been logged, there are no longer trees to produce the rain cycle which【 B5】 _ the atmosphere, or to reduce carbon dioxide levels, contributing to climate change. Because of tropical deforestation, animal and plant habitat is【 B6】_, and at least on
4、e species dies out every day. Thus, the United States has partnered with the private sector, other governments and civil society organizations to form the Tropical Forest Alliance 2020, or TFA 2020. The alliance aims to mobilize and【 B7】 _actions by all partners to reduce tropical deforestation rela
5、ted to key agricultural commodities such as palm oil, soy, beef, and paper and pulp. The United States has【 B8】 _worked to promote the conservation of tropical foress by advancing innovative and cooperative development【 B9】 _, diverse technical expertise and services, and diplomatic leadership. With
6、 the new multi-national, public-private TFA 2020 partnership, we【 B10】 _ further increasing the breadth of our engagement. 1 【 B1】 2 【 B2】 3 【 B3】 4 【 B4】 5 【 B5】 6 【 B6】 7 【 B7】 8 【 B8】 9 【 B9】 10 【 B10】 10 More and more people are taking their tablet computers to bed to surf the web or check Faceb
7、ook or e-mails before【 B1】 _ the light. But using tablets like iPad just before bed can lead to a poor nights sleep, according to research. Researchers are warning that the blueish light their screens【 B2】 _can stop users getting a good nights sleep. That is because this type of light mimics dayligh
8、t, convincing the brain that it is still daytime. Blue light【 B3】 _ production of a brain chemical called melatonin, which helps us fall sleep. This is because our brains have【 B4】 _to be wakeful during daylight hours. By contrast, light which is more orange or red in tone does not restrain melatoni
9、n production, perhaps because our brains recognize it as a【 B5】 _that the day is ending. Neurologists have known for years that【 B6】 _ screens late in the evening can disrupt sleep. Researchers at the Lighting Research Centre say: “Although turning off devices at night is the【 B7】 _ solution, it is
10、recommended that if these devices are used at night displays are dimmed as much as possible and that the time spent on them before bed should be【 B8】 _.“ They drew their conclusions after measuring melatonin levels in 13 volunteers, after they had spent time【 B9】 _iPads at full brightness at a dista
11、nce of 10 inches, for two hours. However, these studies tend to be【 B10】 _of those with chronic sleep disruption, such as long term shift workers, with those who have normal sleep patterns. 11 【 B1】 12 【 B2】 13 【 B3】 14 【 B4】 15 【 B5】 16 【 B6】 17 【 B7】 18 【 B8】 19 【 B9】 20 【 B10】 20 Earlier studies
12、have tied chronic sleep disorders and low levels of sleep to greater risks of heart disease and obesity, and even【 B1】 _life span. But the new study, published in the journal Hypertension, is one of the first to find that its not just how much you sleep, but the【 B2】 _of your nightly slumber that ca
13、n affect your risk for high blood pressure. The goal of the study,【 B3】 _by researchers at Harvard Medical School and elsewhere, was to look specifically at the slow-wave stages of sleep, which【 B4】 _about 90 minutes to two hours of a normal nights rest and【 B5】_the deepest hours of sleep. To study
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