B、Balance television viewing with other contrasting activities. C、Watch some educational TV programs. D、Take more physical exercise. What do the researchers suggest older people do? 讲话中提到，虽然看电视可能有教育和放松的好处，研究人员建议50岁以上的成年人应该尽量确保看电视与其他不同活动之间的平衡。由此可知，本题选B项。ACD项均不是研究人员的建议，故排除。