题目内容：
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.注意：此部分试题请在答题卡2上作答。
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 67 this week from U.N. Habitat, a United Nations agency.
A century ago, 68 than five percent of all people lived in cities. 69 the middle of this century it could be seventy percent, or 70 six and a half billion people.
Already three-fourths of people in 71 countries live in cities. Now most urban population 72 is in the developing world.
Urbanization can 73 to social and economic progress, but also put 74 on cities to provide housing and 75 . The new report says almost two hundred thousand people move 76 cities and towns each day. It says worsening inequalities, 77 by social divisions and differences in 78 , could result in violence and crime 79 cities plan better.
Another issue is urban sprawl (无序扩展的城区). This is where cities 80 quickly into rural areas, sometimes 81 a much faster rate than urban population growth.
Sprawl is 82 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 83 cities to smaller ones. He sees a 84 toward “de-urbanization” across the nation.
85 urban economies still provide many 86 that rural areas do not.
67. A．came on
B．came over
C．came off
D．came out
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