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Explorers and travelers throughout history have had to develop methods for preserving food and A __________________

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Explorers and travelers throughout history have had to develop methods for preserving food and A __________________. This problem was especially difficult during the time B __________________. Great explorers like Columbus, Magellan and Cook carried dried foods and foods preserved in salt and brine.

More recently, refrigeration and canning have provided solutions to the problem of food preservation. However, space travel required that new methods be devised for C __________________. Foods taken into space must be light-weight, compact, tasty and nutritious. They must also keep products D __________________. A variety of menus consisting of foods similar to those displayed here provided each astronaut with 2500 or more calories per day.

John Glenn was the first American to eat in space aboard Friendship 7 in 1962. At that time it was not known if ingestion and absorption of nutrients were possible in a state of zero gravity. Glenn’s consumption of apple sauce, packed in a tube, and xylose sugar tablets with water, demonstrated E __________________ in a weightless environment.

In the weightless environment of space, astronauts exerted less energy in conducting their work than F __________________. Gemini astronauts were allotted 2500 calories a day during space missions, less than their normal intake of 3000 calories. The food, which had 99 percent of the moisture removed to reduce weight, had an average content of 17 percent protein, 32 percent fat, and 51 percent carbohydrates.

  1. keeping foods edible
  2. if they were on Earth
  3. for long periods without refrigeration
  4. carrying enough food for their journeys
  5. when he presented him with a beef sandwich
  6. that people could eat, swallow, and digest food
  7. when people made long sea voyages on sailing ships

Ответ: 471362