2. 外语
  3. ______conservation becomes a matter of policy, the majority of our attractive wild plants and flowers will be under threat of ex

______conservation becomes a matter of policy, the majority of our attractive wild plants and flowers will be under threat of ex

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问题 ______conservation becomes a matter of policy, the majority of our attractive wild plants and flowers will be under threat of extinction.
选项 A、If
B、Whenever
C、Whether or not
D、Unless
答案D
解析 本题考查条件状语从句，据题意，用Unless。题意为，如果保护不能成为一项政策，我们大部分的可爱的野生植物和花卉将有灭绝的危险。
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