2. 考研
  3. A. the next half century B. reducing death rates C. developing world D. infectious diseases Phrases: A. could potentially becom

A. the next half century B. reducing death rates C. developing world D. infectious diseases Phrases: A. could potentially becom

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问题 A. the next half century
B. reducing death rates
C. developing world
D. infectious diseases
Phrases:
A. could potentially become the toughest problem of【T13】______
B. provides the tools and methods for lengthening life spans and【T14】______
C. with virtually all the new growth occurring in th【T15】______
D.【T16】______are much less frequent due largely to public health measures
    It is the application of technology to physical resources that provides for human life and even tually sets the limits on the number of people who can be fed, but technology also【T17】______________   As a result, high birth rates are no longer closely matched by high death rates as they were until modern times;【T18】______; and physical vitality has been increased by improved nutrition. These changes have brought about what is today familiarly called the "population explosion" which, unless checked,【T19】______If the current rate of population growth continues in some parts of the world, the world population is expected to reach 9. 1 billion by 2050,【T20】______while the total population of richer countries is expected to remain largely unchanged at 1.2 billion.
【T13】
选项 A、 
B、 
C、 
答案A
解析 根据语法知识可以判断，介词of后面应该接名词或动名词，但四个选项均符合。这题比较难判断，可以用排除法，确定了69～7l题答案之后，故选A。
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