Listening to the following passage. Altogether the passage will be read to you four times. During the first reading, which will

The emphasis on educational achievement / may be coming at a heavy price. / Researchers say that hard work at school / plus the lack of exposure to outdoor light / is damaging the eyes of almost nine out of ten students./
   The scientists say that genetic factors, / which are long thought to play a big role in short sightedness, / are not as important as the environment. / They suggest that compulsory time outdoors should be considered / by educational authorities as a way of dealing with the problem. /