UNIT 10 Light Bulb

　　Before the light bulb was invented, there was only a candle to light up a room. Finally, in 1879 Thomas Edison invented the light bulb. The first light bulb lasted only 13 hours. But later Edison developed a new light bulb which lasted up to 1,200 hours in 1880.

　　Select True or False

　　❶ Thomas Edison was an inventor. (T/F)

　　❷ Thomas Edison invented candles. (T/F)

　　❸ Thomas Edison invented the light bulb. (T/F)

　　More to know

　　only

　　only 是“只；只有”的意思，当表示只有一个或是唯一的存在时用这

　　个词。

　　··I only have one。

　　我只有一个。

　　··We only have a dollar。

　　我们只有1美元。

　　READING COMPREHENSION

　　*Read and circle the best answer。

　　❶ Before the light bulb, what was the only thing that could light up a room?

　　a. a lamp b. a candle c. a light bulb

　　❷ Who invented the light bulb?

　　a. Alexander Graham Bell

　　b. Albert Einstein

　　c. Thomas Edison

　　*Complete the sentence with the right answer。

　　❸ The first light bulb lasted only 。

　　a. 10 hours b. 12 hours c. 13 hours

　　❹ Edison developed a new light bulb which lasted up to 1,200 hours in 。

　　a. 1879 b. 1880 c. 1888

　　DESCRIBE THE PICTURE

　　*Circle the correct sentence。

　　❶ The fire lights up the room。

　　❷ The candle lights up the room。

　　❸ The lamp lights up the room。