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idea; we can all of us guess and sometimes make a lucky guess. It (5) is quite
another thing to produce a proof of the correctness of that idea. Darwin thought
he had that (6) proof in his (7) notebooks. He (8) saw that all animals had a
struggle to survive. Those (9) which were best at surviving their (10)
environment passed on the good qualities which had helped them (11) to their
(12) descendants. This (13) was called ‘the survival of the fittest’. For example,
in a cold climate, those (14) who have the warmest fur will live. Darwin believed
that this (15) necessity for an animal to deal with its (16) environment
explained the immense variety of creatures.
Taken from A. M. Newth: Britain and the World, Penguin, 1966
No Words Refer to something What it refers to:
Before After
1 which √ the idea of evolution
2 one √ idea
3 it √ the idea of evolution
4 It √ to have an idea
5 It
6 that
7 his
8 He
9 Those
10 their
11 them
12 their
13 This
9
