Page 82 - IELTS Preparation Grammar and Vocab

Relative clauses (1)

Defining and non-defining relative clauses; relative pronouns;
other words beginning relative clauses; prepositions in

Context listening

En You are going to hear part of a commentary from an audio-guide in a museum of science and
technology. Before you listen, look at these photos. What do you think the commentary is about?

vacuum tubes Hertz's experiment

wireless telegraph

ni DE Listen to the commentary. Number the photos in the order they are mentioned.

CIE Listen again and fill in the gaps.
1 in whidi
He devised an experiment
a spark jumped across a gap in a metal ring when
a sparking coil was held a few metres away.
For most people, however, it is the Italian Guglielmo Marconi
2 name is mainly associated
with the development of radio.
The first public demonstration of the power of radio came in 1901
3 Marconi announced
that he had received a transmission from across the Atlantic.
4
There are just a few of the 'wireless telegraphs' that the factory produced left in the world, an example
you can see in Case 2.
Radio waves could not carry speech until a method had been developed
5 the
low-frequency waves produced in a microphone could be combined with high-frequency radio waves.
In Britain, the popularity of radio increased until 1952,
6 four out of five households
owned one.
1.4 What do the words in the gaps in 1.3 refer to?

a spark jumped across a gap in a metal ring when
tn which
He devised an experiment
1
a sparking coil was held a few metres away.
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