D．flavor

　　解析：选A　根据第三段的最后一句可知，树形仙人掌还是动物们的食物。没有了它们，就意味着“食物”的短缺，因此此处选food。scenery “风景”；water “水”；flavor “味道”。

　　19．A.affect

　　B．abandon

　　C．increase

　　D．lose

　　解析：选D　西南部也将失去这些极具重要性的东西，因此此处选lose。affect “影响”；abandon “遗弃，放弃”；increase “增加”。

　　20．A.signal

　　B．sign

　　C．mark

　　D．symbol

　　解析：选D　这些沙漠巨型植物已经变成了这个干燥区域的标志。根据句意可知，此处选symbol “标志”。signal “信号”；sign “征兆”；mark “记号”。

　　.语法填空

　　(2016·江西九校第二次联考)Would you like to explore (勘探) the oceans? Do you want to find __1__ life than we imagine there? For Jacques Cousteau, the answer was “yes”. His career was a lifelong dream, and he is __2__ (probable) the most famous ocean scientist in recent times.

　　Cousteau was born in France in 1910. Even __3__ a child, he loved water. Cousteau was bright, __4__ he got bored with school and began to cause trouble. His parents sent him to a strict boarding school. There, Cousteau finally __5__ (challenge). He studied hard and did well in all his courses. In 1933, he served as a general officer in the French Navy. He also began to explore the life under the water. He worked __6__ a breathing machine to stay under water longer. It was finished in 1943.

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