20xx屆湖南師范大學(xué)附屬中學(xué)高考模擬試卷(二)英語(yǔ)試題(編輯修改稿)
2025-04-05 05:51 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 by more than 50% while reducing raw material costs. During the curing process. CO2 is directly injected into the concrete mixture where it is chemically transformed and permanently stored.CarbonCure39。s technology enables the production of concrete with a reduced water and carbon footprint while increasing the material39。s reliability. The CO2 is transformed into a permanently embedded mineral which can then be bined with new concrete mixes. The technology is able to reduce the material costs and increase profitability for producers.Concrete is a major contributor to global warming as producing it releases a huge amount of carbon dioxide. Yet it39。s the most widely used artificial material, second only to water. Renewable energy sources use much concrete per unit energy produced. If they are to increase enough to make a difference in time to help the planet, getting control of the CO2 in concrete production is essential.28. What does the underlined part “double duty in Paragraph 2 refer to?A. Extracting CO2 and making useful products.B. Cutting CO2 emission and saving energy.C. Removing CO2 and creating value.D. Storing carbon and reducing waste.29. Which is NOT a shared benefit of the two winners39。 technologies?A. They permanently store the CO2.B. They make concrete more reliable.C. They reduce the carbon footprint of concrete.D. They lower the cost of concrete.30. What is stressed in the last paragraph?A. To manage concrete emissions.B. To invest in clean energy sources.C. To cut the use of concrete.D. To find an alternative to concrete.31. What is the text mainly about?A. A petition on global crisis.B. Innovative ways of decarbonization.C. A revolution in the concrete industry.D. The possibility of turning CO2 into treasure.DA chemical signal from the liver, caused by exercise, helps elderly mice keep their brains sharp, suggests a recent study. Understanding this liver — to — brain signal may help scientists develop a drug that benefits the brain the way exercise does.Lots of studies have shown that exercise helps the brain, decreasing the memory declines that e with old age. Scientists have long looked for ways to get elderly people unable to work out to have the same benefits.Saul Villeda, a neuroscientist at the University of California. and his colleagues focused on the fitness effects of blood from young mice. They injected inactive elderly mice with plasma（血漿）from elderly mice that had regularly exercised. After eight injections over 24 days, the former performed better on memory tasks than elderly mice that received no injections.Examining the plasma of exercised mice showed an abundance of proteins（蛋白質(zhì)） produced by the liver. The researchers closely studied one of these liver proteins, called GPLD1. GPLD1 is an enzyme （.酶） It lets other proteins off the outsides of cells, releasing those proteins to go do other jobs. Getting the liver to produce this one enzyme can actually gain all the beneficial effects we see in the brain with exercise,” Villeda says.But the role of GPLD1 is far from settled, says Irina Conboy, a researcher at the University of California. There39。s evidence that GPLD1 levels are higher in people with diabetes（糖尿病），she points out, indicating that the protein may have negative effects. “And different experiments suggest that GPLD1 levels might actually fall in response to certain kinds of exercise in rats with diabetes.” she notes. We know for sure that exercise is good for you, and that this protein is present in the blood. But whether it39。s good or bad, no one knows for sure. ”32. What is the role of exercise in achieving the liver — to — brain signal?A. It promotes blood circulation.B. It maintains the health of liver.C. It speeds up the relay of signal.D. It increases the level of an enzyme.33. According to the text, the function of GPLD1 resembles that of .A. glue B. scissorsC. a marker D. a container34. What is probably Irina Conboy39。s attitude towards the application of GPLD1 for the old?A. Favorable. B. Critical.C. Cautious. D. Ambiguous.35. Which is the best title for the text?A. The brain benefits of exercise for the elderlyB. The link between GPLD1 level and exerciseC. The “exercise pill： potential power of a proteinD. The liver —
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