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  3. The fact that the world’s cities are getting more and more crowded is a well-documented demographic fact. Cities such as Tokyo

The fact that the world’s cities are getting more and more crowded is a well-documented demographic fact. Cities such as Tokyo

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问题     The fact that the world’s cities are getting more and more
crowded is a well-documented demographic fact. Cities such as
Tokyo, Sao Paolo, Bombay and Shanghai are now considered
"mega-cities", reflecting their enormous size and huge populations,
which in many cases is around the twenty million-mark. There
are two main reasons why these and other cities are
becoming so crowded: one economic and other socio-cultural.【M1】______
    Undoubtedly, the primary cause for cities becoming so
crowded is economic. With a country develops, its cities become【M2】______
the engines of development. Furthermore, many jobs are available【M3】______
in these areas. Tokyo, for example, is the motor for Japan’s rapid【M4】______
economic development in the 1960’ s and 70’ s; as a result, its
population increased rapidly. People moved to Tokyo so that they
could find jobs and establish economic security themselves and【M5】______
their families.
    A further factor in the huge increase in urban populations is
the socio-cultural factor. Thousands of people migrating to the【M6】______
cities not only for jobs but also for educational and personnel【M7】______
reasons. The better universities are always located in big cities and
this attracts tens of thousands of students every year. These
students usually stay up and work in the city after they graduate.【M8】______
Moreover, young people will move to the city as if the villages and【M9】______
rural areas are often governed by custom and tradition, which they
believe is an obstacle to their private freedom.
    In conclusion, we can say that amongst the many causes
behind urban population density, the economic or cultural are the【M10】______
most significant. People always move to the areas which provide
opportunity and the freedom they desire. It is now the
responsibility of municipal councils to make sure these people are
housed, clothed, fed and educated.
【M4】
选项
答案is—was
解析 语法错误。此处考查时态的运用。根据此句的时间状语in the 1960’s and 70’s推断．此处应该用一般过去时．而分号后面increased也与此相呼应，所以将is改为was。
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