单选题 To survive in the intense trade competition between countries, we must ______ the qualifies and varieties of products we make to the world market demand.

【正确答案】 D
【答案解析】为了在国家之间激烈的贸易竞争中幸存下来，我们必须使我们生产的产品的质量和品种适应世界市场的需求。Gear to使适应；improve改善；enhance提高，增进，增强；guarantee保证，担保。