初等/五等/佐級◆英文題庫下載題庫

Astronauts eat freeze-dried foods from plastic bags. Freeze-drying is a special __43__ that 

removes moisture from foods that have been quick-frozen. When food is treated in this way, it lasts for a long time without spoiling. It is also lightweight and easy to pack in a spacecraft, 

where every ounce and every inch count. When an astronaut is ready to eat, he uses a 

special__44__to inject water into the package. The water he injects replaces the __45__

moisture that was removed from the food. Now the freeze-dried food will taste__46__fresh food. The astronaut can use hot or cold water for his meal. He can have hot soups as well as cold drinks.