[多项选择]计算机发展过程按使用的电子器件可划分为5个阶段，其中第二代和第四代计算机使用的器件分别为( )。
A. 电子管
B. 晶体管
C. 集成电路
D. 超大规模集成电路

In its most extreme form, poverty is a lack of basic human needs, such as adequate and nutritious food, clothing, housing, clean water, and health services. Extreme poverty can cause terrible suffering and death, and even poverty can prevent people from realizing many of their desires. The world’s poorest people--many of whom live in developing areas of Africa, Asia, Latin America. and Eastern Europe--struggle daily for food, shelter, and other necessities. They often suffer from severe malnutrition(营养不良), infectious disease outbreaks, famine, and war. In wealthier countries--such as the United States, Canada, Japan, and those in Western Europe--the effects of poverty may include poor nutrition, mental illness, drug dependence, crime, and high rates of disease.
Extreme poverty, which threatens people’s health or lives, is also known as destitution or absolute poverty. Relative poverty is the condition of having fewer resources or less income than other
A. Poverty is the condition of having insufficient resources or income.
B. Poverty is a lack of basic human needs.
C. Poverty is the condition of having fewer resources or less income than others within a society or country, or compared to worldwide averages.
D. Poverty is an effect of the uneven distribution of resources around the world on an international or even regional scale.