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Unit 3 READING 2

A ustralia's banana farmers had a
problem. Each year, they had too
many bananas. When the farmers sold
their bananas, there were always extras.
Some bananas were too small, and
some were too old. So, the Australian
farmers just threw the extra bananas
away. They threw away 20,000 tons of bananas a year. That’s a lot of
bananas. They thought this was wasteful, and the old bananas were bad for
the land.

Then some scientists at Queensland University had an idea. They wanted to

turn the extra bananas into electricity. When bananas get old, they put

chemicals into the air. Scientists can use these chemicals .

Today, the scientists are testing their idea. If it works, Australia’s extra

bananas could give electricity to over 500 families!

English Usage

• when + subject + verb, subject + verb
- We use when in time clauses to say that something happened,happens, or
will happen at a particular time or age.
When the clock was striking 10, the race began.
When Daniel was a child, he lived in London.

124 Chapter 6 Science & Technology