三、克漏字測驗【請依照段落上下文意，選出最適當的答案】
      Global demand for meat __16__ by over 500 percent in the last 50 years, partly because the population hasgrown, and also because people are getting richer. If meat production increases to match demand, the __17__ couldbe damaging for the planet. Animal farms already occupy 70 percent of all agricultural land, and rain forests arebeing used to create even more land for this purpose. __18__ large numbers of livestock also consumes a lot ofenergy and causes a lot of pollution. It’s clear that our hunger for meat is not sustainable __19__ . Fortunately,scientists have a solution. They try to make meat in a lab by taking cells from cows to grow muscle. They say thatthis process could __20__ the amount of energy and land needed to raise cattle by about 40 percent.