更多"In this densely populated city, aci"的相关试题:
[单项选择]Acid rain
A. immediately kills trees and affects aquatic life in lakes and rivers.
B. deposits various metals iron, mercury, aluminum into the soil.
C. kills forests by weakening them and reduces fish populations.
D. releases sulfur dioxide, nitrogen oxide and into the atmosphere.
[单项选择]According to the passage, acid rain is
A. a source of pollution.
B. an effect of industrialization.
C. an advantage of industrial society.
D. a deposition of fossil fuels.
[单项选择]Which of the following is TRUE about acid rain
A. It is acknowledged by scientists to be the most serious pollution problem that human beings now face.
B. Many endangered species are on the verge of extinction because of acid rain.
C. Acid rain is composed of sulfur dioxide and nitrogen oxides mixed with water vapor found in the upper atmosphere.
D. Acid rain is mostly found in the United States and Canada.
[单项选择]The damaging effects of acid rain are felt less in the West because _________.
A. Western parts produce much less than a quarter of sulfur oxide emissions
B. Western soils can neutralize the acid
C. Westernly wind spread participants out of the western regions
D. chemical industry is less developed in the western states
[单项选择]The least serious damage caused by acid rain is _________.
A. poisoning of plant roots
B. leaching of heavy metals
C. changing the blood chemistry in
D. corrosion of metal structures
[单项选择]Why is acid rain little understood______
A. Because it is a new phenomenon
B. Because it is not frequent enough
C. Because its formation is complex
D. Because it is difficult to study it
[单项选择]According to the passages acid rain _________.
A. adds minerals to the grain
B. travels with the prevailing westernly wind
C. leads to birth defects in fish
D. and its formation have been fully understood
[单项选择]The city is _____ most densely populated in China.
A. sixth
B. six
C. the six
D. the sixth
[单项选择]The most densely populated region of America is ______.
A. the southeastern part
B. the northeastern part
C. the northwestern part
D. the Middle Plains
[单项选择]A heavily populated agricultural area is one where ______.
A. there are more factories than farms
B. only a few farmers live
C. too many farmers live close to one another
D. people suffer and starve
[单项选择]The heavily-populated area was a breeding place for ______ diseases.
A. infectious
B. powerful
C. influential
D. suspicious
