問題詳情

Do you want something different for dinner? Try some space food. Scientists are experimenting with ways to grow food in space. Scientists think that in 20 or 30 years, astronauts will be able to live in space colonies off the planet. Already many scientists are living for months on the International Space Station high above the earth. It，s too expensive to carry food to feed people living in space colonies. People in space colonies will need to grow food for themselves. But how can they grow food without soil and sunlight?Today, we already have hydroponic vegetables. These are vegetables you can grow without soil. The food can grow in an artificial environment. The science of hydroponics is not new. Many writers believe that the Hanging Gardens of Babylon were actually a large hydroponic system. This system could have used fresh water that was rich in oxygen and minerals for the plants. Hydroponic systems need light. In addition to sunlight, hydroponic farms can use artificial lights. Instead of soil, hydroponic farms can use special material, such as charcoal and mixtures of chemicals, to feed the plants. And in addition to a natural climate, most hydroponic farms often use greenhouses. One advantage of hydroponics is that diseases and insects that travel through the soil are eliminated. Another advantage is that there are no weeds to pull out.Nutrition scientists at Cornell University in New York are experimenting with recipes that use these hydroponic vegetables. The National Aeronautics and Space Agency (NASA) is paying for this nutrition research. The scientists are trying to develop new systems that will increase the flavor and the vitamin content of the foods they grow. Some of the Cornell experiments in cooking are unusual. They make imitation meat dishes, such as carrot drumsticks, made from carrots, peppers, onions, garlic, herbs, and bread crumbs, instead of chicken. They make dishes made from tofu and seitan (a wheat protein) instead of meat. How do these unusual foods taste? The scientists invite a group of taste testers into their laboratories. Every week, 25 people came to taste five different dishes. So far, they have tested 200 different recipes. The carrot drumstick dish was a hit. It rated an eight out of nine. Perhaps soon, people will eat meals made from hydroponic vegetables that are truly out of this world.
46. What is this passage mainly about?
(A) Innovative food for the future.
(B) How to grow vegetables well.
(C) Advantages of hydroponic systems.
(D) Experiments with new recipes that use vegetables.

參考答案

答案：A
難度：適中0.594203
統計：A(82),B(12),C(32),D(7),E(0)

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