America is growing older. Fifty years ago, only 4 out of every 100 people in the United States were 65 or older. Today, 10 out of every 100 Americans are over 65. The aging of the population will affect American society in many ways — edu
America is growing older. Fifty - eight years ago only 4 out of every 100 people in the United States were 65 or older. To day 10 out of every 100 Americans are over 65. The aging of the population will affect(影响)American society in
We achieve this by integrating archaeological radiocarbon data and palaeoclimatic time series to show that population decline occurred coeval with the transition to the initial mid-Holocene across South America. Through the analysis of radiocarbon dates with Monte Carlo methods, we find multiple, ...
1-4 CABA 1. 主旨题。根据第一、二段的最后一句及第三段可判断。2. 细节题。one是a society的同位语且后面跟了一个定语从句，可以通过分析句子结构得出正确答案。3. 细节题。全文最后一句话给出了提示。4. 推理题。可仔细阅读第二段中倒数第二句话。
over time even within a country. Comparability of employment ratios across countries is affected by variations in definitions of employment and population. The biggest difference results from the age range used to define labor force activity. The population base for employment ratios can also vary. ...
Background: The world's population is ageing, and four of the top 10 most rapidly ageing developing nations are from the region of Latin America and the Caribbean (LAC). Although an ageing population heralds likely increases in chronic disease, disability-related dependence, and economic burden,...
America is growing older. Fifty-eight years ago, only 4 out of every 100 people in the United States were 65 or older. Today, 10 out of every 100 Americans are over 65. The aging of the population will affect American society in many ways—education, medicine, and business. Quietly, th...
over the previous 10 years or so by indicating the proportion of the population who have passed through the primary education system and acquired basic literacy and numeracy skills. Generally, literacy also encompasses numeracy, the ability to make simple arithmetic calculations. Data on literacy are...
over time even within a country. Comparability of employment ratios across countries is affected by variations in definitions of employment and population. The biggest difference results from the age range used to define labor force activity. The population base for employment ratios can also vary. ...
It is well known that human population density is highly correlated with environmental and physical factors35 that can plausibly impact the spatial distribution of population and/or be related to it. These may include continuous variables such as intensity of night-time lights36, energy productivity ...