单选题Directions: There are 20 blanks in the following passage. For
each blank there are four choices marked [A], [B], C．and D．on the right side of
the paper. You should choose the ONE that best fits into the passage. Then mark
the corresponding letter on Answer Sheet 2 with a single line through the
centre. Over half the world's people now live in cities.
The latest "Global Report on Human Settlements" says a significant change took
place last year. The report {{U}} {{U}} 1 {{/U}} {{/U}}this week
from U.N. Habitat, a United Nations agency. A century ago,
{{U}} {{U}} 2 {{/U}} {{/U}}than five percent of all people lived
in cities. {{U}} {{U}} 3 {{/U}} {{/U}}the middle of this century
it could be seventy percent, or {{U}} {{U}} 4 {{/U}} {{/U}}six
and a half billion people. Already three-fourths of people in
{{U}} {{U}} 5 {{/U}} {{/U}}countries live in cities. Now most
urban population {{U}} {{U}} 6 {{/U}} {{/U}}is in the developing
world. Urbanization can {{U}} {{U}} 7 {{/U}}
{{/U}}to social and economic progress, but also put {{U}} {{U}} 8
{{/U}} {{/U}}on cities to provide housing and {{U}} {{U}} 9
{{/U}} {{/U}}. The new report says almost two hundred thousand people move
{{U}} {{U}} 10 {{/U}} {{/U}}cities and towns each day. It says
worsening inequalities, {{U}} {{U}} 11 {{/U}} {{/U}}by social
divisions and differences in {{U}} {{U}} 12 {{/U}} {{/U}}, could
result in violence and crime {{U}} {{U}} 13 {{/U}} {{/U}}cities
plan better. Another issue is urban sprawl (无序扩展的城区). This is
where cities {{U}} {{U}} 14 {{/U}} {{/U}}quickly into rural
areas, sometimes {{U}} {{U}} 15 {{/U}} {{/U}}a much faster rate
than urban population growth. Sprawl is {{U}} {{U}}
16 {{/U}} {{/U}}in the United States. Americans move a lot. In a recent
study, Art Hall at the University of Kansas found that people are moving away
from the {{U}} {{U}} 17 {{/U}} {{/U}}cities to smaller ones. He
sees a {{U}} {{U}} 18 {{/U}} {{/U}}toward "de-urbanization"
across the nation. {{U}} {{U}} 19 {{/U}} {{/U}}urban economies
still provide many {{U}} {{U}} 20 {{/U}} {{/U}}that rural areas
do not.