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Comprehension Checkup
Comprehension Checkup

A Circle the best answer.

1. When was Morse code developed?
a recently b a few years ago c over 100 years ago

2. What is a pulse?
a a flash of light b a code with messages c a pattern of a letter

3. How does a code of each alphabet letter differ? (Choose 2 answers.)
a length of pulses b types of lights

c strength of pulses d number of pulses

4. Why does the writer mention sinking ships?
a to describe pulses of lights

b to explain how Morse developed codes
c to give an example of using Morse code
d to emphasize some letters of the alphabet

B Complete the sentences.

A long time ago, people used lights to ➊ over long

➋ . Morse code uses ➌ lights and we call

them pulses. We can send message with pulses.

Wrap Up Fill in the blanks.
Wrap Up

Morse code long

용도 • to communicate over ➊ distances
alphabet
• using a ➋ of light as a pulse
flash
방법 • making ➌ letters with long and short
➍ patterns pulse

15

2020. 12. 22. 오후 12:52
미국교과서리딩_2권본문(6).indd 15
미국교과서리딩_2권본문(6).indd 15 2020. 12. 22. 오후 12:52