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 91. Archaeological and geological excavations indicate which a primitive type of corn was used as food in North America at least 7,000 years ago.  答案：B分析及考点：连接词误用。宾语从句连接用that，不能用which替代。参考译文：考古学和地质学挖掘发现表明远古种类的谷物早在7千年前就被当作食物了。 

92. The major component of the sedimentary rock called shale is clay, an earthy, fine-grained material consisting primary of a particular group of crystalline minerals.  答案：C分析及考点：修饰动词用副词。Consist of 固定搭配，primary修饰consist，应改成primarily参考译文：被称为页岩的沉积岩的主要成分是粘土，一种土质的，有细密纹理的材料，主要包含一组特殊的水晶矿物质。 

93. Copper was the first metal used by humans and is second only to iron into its utility through the ages.  答案：C分析及考点：介词误用。改成in its utility参考译文：铜是人类首先使用的金属，也是很多年里使用性仅次于铁的金属。 

94. The mineral chalcopyrite usually is found in compact masses or in mixtures with various other mineral as opaque, brass-yellow, tetragonal crystals.  答案：C分析及考点：名词单复数误用。改成minerals参考译文：黄铜矿通常以不透明的黄铜色的四角形结晶的方式在紧密物质或和其他各种矿物质混合体中被发现。 

95. Because the study of chemistry encompasses the entire material universe, it is central to the understand of other sciences.  答案：D分析及考点：词性误用。Understand原形是动词，这里应该用作名词形式understanding.参考译文：因为化学研究包括了整个物质世界，所以它是理解其他科学的中心。

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