共用题干An active lifestyle and a healthy fish-rich d

共用题干

An active lifestyle and a healthy,fish-rich diet are not only good for your heart,________(46),two leading neuroscientists said on Wednesday.
As people live longer,finding ways of halting the decline in mental agility is becoming increasingly important,said professor Ian Robertson，_________(47).
"The biggest threat to being able to function well and properly is our brains,"___________(48).
"There is very strong evidence,___________(49),that the degree to which you maintain your mental faculties depends on a handful of quite simple environmental factors,"he said.
__________(50),avoided high stress levels and enjoyed a rich and varied social life are better equipped to stay alert as they age.Mental stimulation,learning new things and simply thinking young also help.

________（49） A:they may also help tackle the memory ioss associated with old age B:he told journalists C:director of the Institute of Neuroscience at Trinity College Dublin D:Those who remained physically fit E:particularly in the over-50s F:It’s important to keep our brain active.