【单选题】
阅读下面短文，从短文后所组的A、B、C三个选项中选出能填入相应空白处的最佳选项。
But there are serious problems in big cities, {{U}} (44) {{/U}}. It’s {{U}} (45) {{/U}} to live there, and there are too many people in some places of big cities.Every year many people move to the cities, because they can {{U}} (46) {{/U}} find jobs, to study at good schools and to receive good medical care there.But {{U}} (47) {{/U}} these people cannot find work or a good place to live in.Also too many people in a small {{U}} (48) {{/U}} makes it hard to keep cities {{U}} (49) {{/U}} and clean.
Some people enjoy living in big cities, others do not. {{U}} (50) {{/U}} people move to a big city, they should think about the problems of living there.
B．
C、
C、safe
网考网参考答案：C
网考网解析：
[详细解答] 分析上下文，显然多人聚集在一处是一个不好的现象可能危害社会安全，因此选safe。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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