越是辛苦努力得到的成功人越觉其珍贵，也越懂珍惜。对于可爱的实验小鼠而言也是如此。

　　Maybe your dad said, “The harder you work for something, the more you’ll appreciate it.” Well, father really did know best. Because a new study finds that the harder mice have to work for a treat, the better it tastes. The research appears in the Proceedings of the Royal Society. [Alexander Johnson and Michela Gallagher, "Greater effort boosts the affective taste properties of food"]

　　Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water. Press the other and they get a drop of different tasting sugar water.

　　Then things got interesting. For one of the treats, scientists gradually increased the amount of effort required for the payoff—from one lever-press to five, then 10, then 15. So by the end of the session, one type of sugar water cost 15 times more effort than the other.

　　The mice then retired to their home cage where both treats were freely available. And they showed a strong preference for whichever reward they’d worked harder to obtain. Based on how fast the mice sipped, they appeared to find the costlier sugar water more tasty.

　　Which makes evolutionary sense. An animal wouldn’t survive if a little hard work left a bitter taste in its mouth.

雅思：一大一小两篇作文, 小作文话题中的各种常规图表、柱状图、线图、饼图等交替出现，大作文的话题出现比较全面, 包括了政府、环境、科技、媒体、犯罪、文化、动物等各种争议性话题，与其他衡量英语语言熟练程度的考试相比, 五分之四的招生负责人更注重托福考试，托福考试是评估学生的英语语言技能的有效手段, 与其他英语语言考试相比, 它可提供更为精确的分数, 更有助于招生负责人作出招生决策。托福考试是全球受到最广泛认可的英语水平测试，被130个*、逾8,500所大学和其它机构所认可, 其中包括英国和澳大利亚的几乎所有顶尖大学，托福考试比其他考试更加轻松，全球超过165个*, 4500个考点都可举行，为考生创造便捷条件, 帮考生缩短时间和节省开销, 全部考试都在一天内完成—不像其他考试要求分为两天继续, 节省了考生的时间及花销。