50. A. a                 B. an               C. the            D. that

（A）

   Television is good. You'd like to watch it all day and all night. But too much TV is a very bad thing. Scientists found that kids who watch too much TV may have more trouble learning to read. They can't focus on their work.

   Kids learn language skills best by reading, talking and playing with others. If they spend too much time watching TV, they'll have less time for those things. Watching too much TV is bad for people's health. People don't move much while watching TV. What's more, they may eat a lot of food while watching. This can make them fat. We call these people "couch potatoes".

   Fighting on TV is a big problem for kids. Young people are good at following. Scientists have found that those who watch a lot of fighting shows are more likely to fight.

49. A. but               B. so              C. too            D. or

48. A. again             B. too               C. so             D. because

47. A. after              B. ago              C. later           D. before

46. A. it                       B. one             C. the other        D. another