1 . 体力活动对身体有好处，并且越来越多的证据表明，它对大脑也有好处。(同位语从句)
Physical activity does the body good, and there’s growing evidence __________________.

2 . _____________________________________ , but the effects on mental ability are different from person to person.
众所周知，随着身体衰老，大脑会萎缩，但对智力的影响因人而异。