In the south, one effect to the development of the oil industry might

In the south, one effect to the development of the oil industry might be _____.

a large reduction on unemployment.

a growth in the tourist industry.

a reduction in the number of existing industries.

the development of a number of service industries.

答案及解析：本题考查推理判断。C选项，现存工业数的减少。第三段开始“可是石油工业的影响并不仅仅限于北方。近百分之一百的就业率，使每个人都见到发展的势头，服务业和旅游业的好多工人转向石油工业。某些较小的工业，在从国外购进货物更便宜的情况下，很可能会全部消失。”这说明工业数减少。综上，C选项正确。A选项，大大减少失业。文内没有涉及，故排除。B选项，旅游行业增长。文内没有涉及，故排除。D选项，许多服务公司发展。文内没有涉及，故排除。故正确选项为C。