单选题Directions: there are twenty blanks in the following
passage. For each blank there are four choices marked A, B, C and D. You should
choose the ONE that best fits into the passage. Then mark the corresponding
letter on the Answer Sheet. Big cites today are
confronted with very serious problems. Transport is a {{U}} {{U}}
1 {{/U}} {{/U}}difficulty: some planers believe in {{U}} {{U}}
2 {{/U}} {{/U}}transport system; others believe in making it possible
for citizens to move {{U}} {{U}} 3 {{/U}} {{/U}}in private cars.
There are several ways of {{U}} {{U}} 4 {{/U}} {{/U}}a public
transport system. Sometimes it is built under the ground, sometimes it is on the
{{U}} {{U}} 5 {{/U}} {{/U}}, and sometimes it is even above
ground level, {{U}} {{U}} 6 {{/U}} {{/U}}in parts of New York
and more crime and Tokyo for example. In most case, of course, it is a {{U}}
{{U}} 7 {{/U}} {{/U}}of some or all of these elements.
The {{U}} {{U}} 8 {{/U}} {{/U}}of the city centers has
also been a problem in the last 3O years. The hearts of many cities have become
poorer and poorer, {{U}} {{U}} 9 {{/U}} {{/U}}more and more
crime and violence, {{U}} {{U}} 10 {{/U}} {{/U}}the people who
can afford to have moved out to the {{U}} {{U}} 11 {{/U}}
{{/U}}. This is the opposite of the situation 100 years ago, {{U}} {{U}}
12 {{/U}} {{/U}}wealthy people lived in the center, and the poor lived
{{U}} {{U}} 13 {{/U}} {{/U}}the outskirts of the city.
Ecological problems also {{U}} {{U}} 14 {{/U}} {{/U}}, as
factories and cars pollute the air, tree are cut down to make {{U}}
{{U}} 15 {{/U}} {{/U}}for urban clearways, and crowded conditions
cause garbage to {{U}} {{U}} 16 {{/U}} {{/U}}in the
streets. In order to solve these problems, some planners
believe we should limit the size of our cities, perhaps by restricting
population, or perhaps by offering {{U}} {{U}} 17 {{/U}}
{{/U}}jobs in the provinces. Others believe that cities cannot be limited in size
and that the problems must be solved in a {{U}} {{U}} 18
{{/U}} {{/U}}of ways—by creating green areas, building {{U}} {{U}}
19 {{/U}} {{/U}}houses for everybody, stopping factory pollution,
{{U}} {{U}} 20 {{/U}} {{/U}}motor transport, and so on.