56. Tom is old enough to know how to look after ________(he).
C) 根据短文内容，选择适当的单词或词组填在题后的横线上，使短文内容意思完整。
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millions of, much cheaper, listeners, carry, blind people |
Radio and television are very popular in the world today and 57 people can see and hear what happens in the world. Now radio is still with us. And the number of the 58 is becoming larger. One reason for this is the invention of the transistor (半导体) radio. A transistor radio is small and easy to 59 .You can put one in your pocket and listen to it on your bike when you go to work. Radio is better for 60 , for old people whose eyesight is not good enough to watch TV, and for people who are busy working. What’s more, radio is 61 than TV.