A three-month survey of 119 households in Seattle found about one-third of the food thrown away was edible（可以吃的）.
  "We think we are doing better but we can't be, given the waste," said Andrea Spacht, a food specialist at the Natural Resources Defense Council.
  For every item thrown away, the cost is far more than just an uneaten meal. Throwing out just one hamburger, for example, wastes as much water as a 90-minute shower.
  The waste of nutrition and resources on this scale （规模）makes little sense when 15 million American households have been classified as food-insecure by the U. S. Department of Agriculture-meaning they cannot access enough food.
  But food waste is not just about households. It is happening on a large scale on the farm.
  Most farm food waste is due to a lack of buyers or prices that are too low. Without a guarantee of an income that will at least cover the cost of harvesting, growers have no choice but to leave food in the field-despite the huge waste that represents, said Lisa Johnson, of the Department of Horticultural Science at North Carolina State University.
  For the time being, the U. S. remains a contradiction, say food waste activists. "It's the place in the world where the most food is wasted, but also where some of the most exciting solutions are," said Tristram Stuart, founder of Toast Ale, which makes beer from bread that would otherwise be thrown away.
  The past few years have seen an awakening awareness of the impact of the problem on our planet. An increasing number of food waste companies and charities have appeared to help people cut their own food waste and also ensure unwanted food makes its way to where it is needed.
  While campaigners are celebrating the rising consumer and corporate （公司的） recognition of food waste as a major problem, they do not expect the problem to disappear overnight. Dealing with the problem requires "a transformation that will take years," said Evan Lutz, co-founder of the food waste company Hungry Harvest.



Why does the author mention the example in Paragraph 3？ ______

A. To encourage readers to save water.
B. To prove the popularity of hamburgers.
C. To show that people are doing better in saving food.
D. To explain that throwing away food has hidden costs.

Why do growers leave food in the field according to Lisa？ ______

A. The food goes bad.
B. The food isn't ripe.
C. They cannot make a profit.
D. They do not have the machine to harvest.

What do the food waste activists mean by saying "the U. S. remains a contradiction"？ ______

A. Food waste contradicts food insecurity.
B. Food waste contradicts exciting solutions.
C. The lack of buyers contradicts good harvests.
D. The high cost of harvesting contradicts low food prices.

What does Evan think of the food waste problem？ ______

A. Americans waste the most food.
B. It has been in existence for years.
C. Solving it will take a long time.
D. People are becoming aware of its seriousness.