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1. The substance can be added to gasoline to accelerate the speed of automobiles. A) quicken B)shorten C) loosen D) enlarge 1. A. accelerate v.加速, 促进, 所以A是答案。shorten v.缩短, 变短;loosen v.解开, 放松, 松开; enlarge v.扩大, 放大; 词缀-en通常加在某些形容词的前面或后面，使其变成相应的动词，该词缀的含义是使变得更加.., 如：enlarge就是使变得更大/扩大。 2. We should never content ourselves with only a little knowledge. A) convince B)satisfy C) comfort D) benefit 2. B. 根据句意判断B是答案。convince vt.使确信, 使信服; benefit n.利益, 好处vt.有益于, 有助于; comfort n.安慰, 舒适vt.安慰, 使缓和。 3. We should contemplated the problem from all sides. A) deliberated B)thought C) described D) designed 3. A. 借助搭配结构问题排除B和D。根据句意判断A最合适。 4. His health had deteriorated while he was in prison. A) became better B)became worse C) became stronger D) became weaker 4. B. 借助搭配健康，排除C和D和 weak都不能与health/健康搭配使用，只有身体才说强弱)，再借助句意判断B最合理。deteriorate v.恶化 。 5. How can we reduce the risk of cancer? | 
