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1998
mobile phone
plastic
communicate
1973
digital camera
Metal and plastic
take photos
1975
A：What is … made of?
B: It is made of …
A: What is it used for ?
B: It is used for …
A: When was it invented?
B: It was invented in …
Review
In 1895 in 1903 in 1879
Wilbur and Orville Wright
Guglielmo Marconi
Thomas Edison
bulb
airplane
in 1879
in 1895
in 1903
1b Listen to 1a and choose the correct answers.
( ) 1. Where are Michael and Jane?
A. In the science museum.
B. At the school library.
C. In the zoo.