5. Which numbered sentence is the topic sentence? (1) One final effect of radio and television on the English language should be noted. (2) There is
no doubt that these great media of information have considerably reduced the time that used to
be devoted to reading, (3) Radio and television may enhance the spoken word. (4) However,
they may develop audiences who do not know how to think independently
1
2
3
4

[1] when the twins grew up, they continued to fight. [2] one day they decided to hold a contest to determine who was stronger. [3] though they tried to defeat each other in many different ways, neither one could win. [4] on the last day, they fought with weapons. [5] using a deer antler, the right-handed twin overpowered his brother, and he threw him off the edge of the earth. [6] today, the right-handed twin lives in the sky-world, and the left-handed twin lives in the dark underworld. [7] they rule the earthly world of men together.