举一反三
- Population policies have significant legal, social, ethical, and cultural impact. Optimal population size appears adequate for economy, education, healthcare, and environment. Family planning is important for adjusting the size of population.
- There is a rapid increase in population in that country that has caused a food (short) ________.
- 2) Why will food production have to increase 70 percent by 2050? Because the population will increase to _______ by 2050.
- The main factors contributing to the dramatic increase in the human population in the 20th century are A: industrial revolution and modern medicine. B: increased education and new pesticides. C: increased immigration and decreased warfare. D: new agriculture methods and new food crops. E: decreased warfare and increased birth control.
- A marketing group is studying population trends. It predicts that the population P of a certain city will increase at the rate of dP/dt people per year, where dP/dt=15000/sqrt____ and t is the number of years past 1980. What is the expected increase in population from 1980 to 2001?
内容
- 0
5) Which increases faster, water use or population increase? It is ________ that increases faster.
- 1
With the_______ of living conditions throughout the world, there has been an increase in the life expectancy of the human race.
- 2
According to the author, the main problem of our environment today is ______. A: the increase of population B: the limited energy resources C: the more serious air pollution D: the development of technology
- 3
但随着人口的增加，很多古老的胡同已经消失，取而代之的是现代化的却没有特色的高楼大厦。 A: However, with the increase of the population, many old Hutongs have disappeared and replaced by modern but not characterized high-rise buildings. B: However, with the increase of the population, many old Hutongs (Chinese alleys) have disappeared to make way for modern but not characterized high-rise buildings. C: / D: /
- 4
Birth rates decline, and mortality of young and adults increases when the population approaches______.