420. There is no doubt that students who are athletically inclined will reap the most benefits from a policy that requires physical exercise to be part of every school day.
如果制定一项政策，规定学生在校期间必须每天锻炼身体，毫无疑问，受益最多的将是那些有运动细胞的学生。

六级词汇讲解:
there is no doubt that...使用了一个主语从句，表示“毫无疑问的是……”，who引导定语从句，修饰students；that同样引导定语从句，修饰policy。reap意为“获得，得到报偿”，reap profits/benefits from/through意思是“从……获得利润/利益”。也可以使用以下这些句型表达同样的意思：
There is no denying the fact that...
No one can deny the fact that...
No one can doubt the essential fact that...
It is indisputable that...

句型拓展:
It is an undeniable fact that using tobacco will be harmful to your health.
毫无疑问，吸烟有害健康。
There is certainly no denying that stricter penalties may to some extent bring down the number of accidents on motorways as a deterrent to driving offences.
毫无疑问，更为严厉的惩罚在一定程度上可以遏制违章驾驶，从而减少高速公路上的事故数量。
No one can deny the fact that a person's education is the most important aspect of his life.
没有人能否认教育是人生最重要的一方面。