2. 外语
  3. To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to

To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to

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问题 To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.
选项 A、improve
B、enhance
C、guarantee
D、gear
答案D
解析 improve“改善，增进”；enhance“增加，提高”；guarantee“保证，担保”；gear (常与to连用)“使适应，使适合”。根据句意和各个选项的意思可知，正确答案是D。
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