题目

读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 In the face of a changing climate and an ever-growing population, strengthening the world's future food security has never been more important. That's where seed banks come in, and their goal is (preserve) as many plant species as possible. The Svalbard Global Seed Vault in Norway is the so-called "mothership" of seed banks and stores back-ups of more than one million plant (sample). Scientists have cross-bred (杂交) certain seeds to produce beans and potatoes that are (rich) in vitamins, zinc and iron than standard varieties. These (improve) varieties have been sent to Africa and elsewhere in Latin America, benefits for public health. But seed bankers still need to work fast. According to UN Food and Agriculture Organization, 75% of global crop species (lose) over the past century. At the same time, about 40% of the world's plant species are at risk of extinction, most of the world's food comes from just a handful of plant and animal species. Though there are more than 7,000 plant species on the planet, just three——rice, maize and wheat—— (be) the staple food of over half the world's population. That is seed banks are so important. 答案：【1】to preserve【2】samples【3】richer【4】improved【5】with【6】the【7】has been lost【8】and【9】are【10】why

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