①人类与疟疾的斗争几乎贯穿了欧亚大陆整个人类文明史，人们最开始用来对付疟疾的灵丹妙药是金鸡纳树皮的提取物奎宁。但是好景不长，逐渐出现了能够对抗奎宁的疟原虫，人们迫切需要新的“武器”来对付不断升级的疟原虫。首先使用的是胡椒酮，但其在临床试验中并没达到预期的效果，胡椒酮并不能消灭人体内的疟原虫，与疟疾...
这与文章不符,因为从第一段第一、二句话(Whenconsideringalternativeenergysourcestoreplacefossilfuels,itshouldbepointedoutthatourpresenttechnologyisdependentonfossil——basedenergyintwomainforms:electricityproducedbyburningcoal,andportablechemicalfuelssuchaspetroleumornaturalgas.Atpresentnotallcountriesaretotallydependent...
Here are some further issues, which it would have been helpful for the programme to cover: The programme failed to explain that it is our over-dependence on fossil fuels, especially gas, which is the main culprit behind soaring electricity bills. In its latest detailed review of consumer ...
根据The field of solar energy is developing fast.Scientists around the world have been improving solar panels.Some have been working on ways to join solar panels and wind power together.Some have been trying to use sunlight to produce liquid and gas fuels(液体和气体燃料).可知太阳能领域发展迅速...
故选B。 D Fossil fuels are rapidly warming the planet, and the aerosols (气溶胶) from their burning process kill millions of people each year. But those aerosols can also cool the atmosphere. It creates an odd climate contradiction. If we burn less gas, oil, and coal, we'll stop ...
1[单选题]Which the following is true according to Paragraph 2? A. It is possible to replace fossil fuels with cleaner fuels now. B. Fossil fuels are more efficient and environmentally friendly. C. Environmentalists hold that fossil fuels produce greenhouse gas. D. The perfect source of renew...
Using energy more efficiently and moving to renewable energy(wind, solar, geothermal, and bio-energy)would significantly reduce our emissions of heat-trapping gases. The United States currently produces 70 percent of its electricity from fossil fuels such as coal, natural gas, oil, but only two ...
Select the correct answer. Which of the following elements makes up the majority of Earth's atmosphere? a. Oxygen b. Hydrogen c. Argon d. Nitrogen Elements in the atmosphere Although the Earth's atmosphere contains a lot of nitroge...
principle. According to Junker’s principle, the rise in temperature of a known volume of water can be found out by burning a known volume of gas and imparting the heat with maximum efficiency to steadily flowing water. Then the calorific value of the gas is f...
Europe, A Would-beAfricaPassage 3Questions 11 to 15 are based on the following passage:How can we get rid of garbage(垃圾)? Do we have enough energy sources to meet our future energy needs?These are two important questions that many people are asking today. Some people think that man ...