2 In pairs. Describe these inventions and what they do. Example a They give information about a product. They are very useful for shops and delivery companies.
a barcodes b batteries c SIM cards
d solar panels
e light bulbs
C21 3
In groups. Rank the items in 2 by their usefulness (1 = most useful). Add three more items to the list. Share your ideas with another group.
CRITICAL THINKING: Evaluating usefulness
See page 89➝ 4 Look at the three photos below. Can you guess the connection between them?