单项选择题

A. No, we are in a traffic jam. B. No, it is failed.
C. Yes, it is not bad. D. Yes, we came by yet.
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What is introduced in this advertising letter A very useful ______ called SinaNet.
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A century ago, less than 5% of all people (11) in cities. By the middle of this century it could be 70%, or almost six and a half billion people. Already three-fourths of people in developed countries live in cities. Now most urban population growth is in the (12) world. Urbanization can lead to (13) and economic progress, but also pressure on cities to provide housing and services. The new report says almost 200,000 people (14) into cities and towns each day. It says worsening inequalities, driven by social divisions and differences in (15) , could lead to violence unless cities plan better.
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