GMAT申友逻辑CR题库-The population of Megacity, a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century.-破解版07-真题答案解析

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The population of Megacity, a sprawling metropolis in Remsland, has

grown at a fairly steady rate for over a century. A hundred years ago, poor sanitation in the city caused high mortality rates among the city's inhabitants, and what fueled the population increase was immigration from rural villages. This immigration has continued and even increased. Moreover, in recent decades, city sanitation has improved enormously. Yet the city's population growth has not significantly accelerated.

Which of the following, if true, most helps to explain why the city's population growth rate has not changed?

(A) Mortality rates that were associated with poor sanitation in Megacity a hundred years ago were orders of magnitude higher than are mortality rates associated with vehicular traffic, which is currently a major cause of death in the city.

(B) For several decades, Megacity, as distinct from the countryside, has had a steadily declining birth rate.

(D) The great majority of immigrants to Remsland settle in Megacity, at least initially.

(E) Megacity has long offered better employment prospects than most rural areas.

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答案：

M城人口稳�

�增长了超过一个世纪。一百年前，卫生状况差导致了高婴儿死亡率，农村人进城导致了人口增长。进城情况继续并增长了。近几十年，卫生情况大大改善。但城市人口增长缓慢解释题进城继续增长，卫生更好了，婴儿死亡率应该少了，但人口增长慢，解释矛盾 (A)100年前卫生相关的死亡率比现在交通事故死亡率高得多；那改善卫生应该增加更多人口才是，更无法解释矛盾，排 (B)几十年来，M城出生率持续下滑；出生率下滑导致人口增长慢，正确 (C) 比M小的城市也经历了人口增长；其他城市，无关 (D) 大部分移民至少最初都在M城定居；过去发生的情况，无关，排 (E) M城比农村提供更好的就业；应该更能吸引人口，方向反，排。