方法二、由“主线”确定主旨大意

　　[典例](2017·湖北高考阅读理解C节选)We've reached a strange — some would say unusual — point.While fighting world hunger continues to be the matter of vital importance according to a recent report from the World Health Organization (WHO), more people now die from being overweight, or say, from being extremely fat, than from being underweight. It's the good life that's more likely to kill us these days.

　　Worse, nearly 18 million children under the age of five around the world are estimated to be overweight.What's going on?

　　We really don't have many excuses for our weight problems.The dangers of the problem have been drilled into us by public­health campaigns since 2001 and the message is getting through — up to a point.

　　In the 1970s, Finland, for example, had the highest rate of heart disease in the world and being overweight was its main cause.Not any more.A public­health campaign has greatly reduced the number of heart disease deaths by 80 per cent over the past three decades.

　　Maybe that explains why the percentage of people in Finland taking diet pills doubled between 2001 and 2005, and doctors even offer surgery of removing fat inside and change the shape of the body.That has become a sort of fashion.No wonder it ranks as the world's most body­conscious country.

　　We know what we should be doing to lose weight — but actually doing it is another matter.By far the most popular excuse is not taking enough exercise.More than half of us admit we lack willpower.

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