A、They like the couches. B、They are always lazy. C、They like the TV programs. D、They get used to the passive activity. D题干询问为何人们

Perhaps the most interesting aspect of the struggle for survival is how easily organisms can be harmed by which they desire. The fish is caught by the fisherman’s lure, the mouse by cheese, and man by the world’s most popular leisure machine, television.
    Most people admit to having a love-hate relationship with television. They complain about the " couch potatoes" , and then they settle into their sofas and grab the remote control. (27) The amount of time people spend watching television Is astonishing. According to a research, on average, American adults spend four hours a day in front of the TV—fully half of their leisure time. Over a lifetime, that’s more than nine years. Yet, we love to complain that we don’t have time for the things we really want to do.
    There are two reasons we end up watching more TV than we know we should. People think they need it and it’s easy. We usually don’t realize how many hours we’re watching television. (28) Since it’s a passive activity, with feelings of lowered alertness continuing even after the set is off, watchers typically find their energy and concentration are low-Laziness sets in. Hence, there is no motivation to get up and do something else once you’re planted on the couch.
    Don’t make it easy to be a potato. (29) Instead of being a passive watcher, you should have a plan in place for your time and don’t watch beyond what you’ve planned. When your show is over, turn the TV off.
26. What does the speaker focus on?
27. What does the research about American adults show?
28. Why do people watch more TV than they expect?
29. What does the speaker suggest people do?