A. **immigration**(移民) - 移民是美国人口增长的主要来源之一,因为美国长期接受大量来自其他国家的移民,这直接增加了人口数量。 B. **social security**(社会保障) - 社会保障是福利政策,与人口增长无直接关系。 C. **high birth rate**(高出生率) - 美国的出生率近年处于较低水平,并非主要增
A. Tide energy B. Geothermal energy C. Biofuel D. Hydrogen E. nergy 相关知识点: 试题来源: 解析 B。解析:本题考查地球能源来源的知识。地热能是从地球获取的主要能源之一。A选项潮汐能主要是月球引力等引起的;C选项生物燃料主要来源于生物;D选项氢能不是直接从地球获取的主要能源。反馈...
about 20 minutes on this task.The two graphs show the main sources of energy in the USA in the 1980s and the 1990s.Write a report for a university lecturer describing the changes which occurred.Write at least 150 words.model answer:The two graphs show that oil was the major energy s ...
Despite the momentum of recent years, the fact remains that the energy transition is only in its infancy. Roughly halfway through what has been called climate’s decisive decade, and in the face of rising global uncertainties, it is time for a pragmatic reality check to understand where are ...
M. Galaxy pairs in the Sloan Digital Sky Survey. IV. Interactions trigger active galactic nuclei. Mon. Not. R. Astron. Soc. 418, 2043–2053 (2011). Article ADS CAS Google Scholar Trakhtenbrot, B. et al. ALMA observations show major mergers among the host galaxies of fast-growing, ...
Still, despite the technical advances seen in the last decades, the International Energy Agency has identified many sectors that are not on track to achieve the global climate mitigation goals by 2030. Here, a multi-stakeholder group of nanoscientists from the public, private, and philanthropic ...
China is in the process of drafting its 15th Five-Year Plan for National Economic and Social Development covering the period of 2026-30. The document will serve as one of the major roadmaps toward China's goal of modernization by 2035. As part of the drafting process, a one-month online...
So putting all that together and bringing it to our products at the depth and breadth is what I think is really pleasing to see. For example, people may not have noticed it much. It was so quick. We spoke about text diffusion models in the middle of the whole thing, ...
The AI race is transforming northwestern Nevada into one of the world's largest data-center markets—and sparking fears of water strains in the nation’s driest state. By James Templearchive page Did solar power cause Spain’s blackout? Renewable energy is changing the grid. How can we keep...
In the United States, close to 10 percent of adults struggle with depression. But because it's a mental illness, it can be a lot harder to understand than, say, highcholesterol. One major source of confusion is th...