Error Correction.doc

Instructions
Read the text below. Some of the lines contain an extra, incorrect word. If there is an extra, incorrect word in a line type the word in the box on the right. If the line is correct, type 'OK'. For example:
0 when
00 OK

Shell Shock

0 In times of trouble when snails have the perfect escape
00 but retreating into a shell does not always guarantee
1 a survival. For the land snail Arianta arbustorum,
2 faced with local climatic warming in the Swiss city
3 of Basle, having had a shell has not helped a bit.
4 Between 1903 and 1991 this snail became really extinct
5 at 16 out of 29 localities around the city. All eight
6 populations were killed off by urban development but
7 the other eight sites continue on to support healthy
8 populations of these other mollusc species. Snail
9 experts at Basle University checked on the differences
10 between the sites where the snails all live and those from
11 which they had been disappeared. The only difference
12 was ground temperature. Built-up districts which emit
13 more heat, and in otherwise perfectly suitable habitats
14 Arianta had died out at sites that were quite artificially
15 warmer. The difference was often just a few warm degrees.
16 Small as this very difference was, its effect was huge.

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