为了提高广大学生的英语水平，提高英语专业学生的专四通过率，特提供以下英语长难句，供大家练习参考：
171. But it’s easy to kill creativity by giving rewards for poor performance or creating too much anticipation for rewards.
172. The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been insignificant.
173. It may then take us a long time to render it intelligent by loading in the right software or by altering the architecture but that too will happen.
174. As the intelligence of robots increase to match that of humans and as their cost declines through economies of scale we may use them to expand our frontiers.
175. Further ahead, by a combination of the great wealth this new age will bring and the technology it will provide, the construction of a vast, man-created world in space, home to thousands or millions of people, will be within our power.
171、但是如果对绩效差的业绩也进行奖励或者让人们对奖励有太多的预期，是很容易抹杀创造性的。
172、冰箱对环境的影响是显而易见的，而它对促进人们幸福的贡献却是微不足道的。
173、装载正确的软件来使它智能化可能要花费我们很长的时间，或者也可以改变它的结构，但同样的情况也会发生。
174、由于机器人的智能增长到了人脑的程度，加上通过规模经济降低了生产成本，我们可以使用它们来拓展前沿。
175、在将来，通过新一代人创造的财富和科技，建设一座可以容纳千百万人的人造大型太空站也是可以的。