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: 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.
举一反三
- The assembly line significantly _________the assembly time per vehicle and _______the profit margin. A: decreased; increased B: increased; decreased C: increased；increased D: decreased；decreased
- The natural rate of unemployment will most likely increase if A: the minimum wage rate is decreased B: unemployment benefits are increased C: monetary growth is decreased D: income taxes are increased E: all of the above
- Which one is the main mechanism of inflammatory edema? ( ) A: Decreased plasma colloid osmotic pressure B: Increased capillary permeability C: Lymphatic obstruction D: Increased ANP E: Decreased GFR
- The main cause of pollution is ______. A: the release of artificial or natural substances into the environment B: the production of new industrial goods C: increased amounts of a natural substance D: our ever-increasing population
- The main cause of pollution is （） A: the production of new industrial goods B: increased amounts of natural substance C: our ever-increasing population D: the release of artificial of natural substances into the environment