4. a gas which unites with many substances
解析:本题主要考查物质的词义辨析。matter和substance侧重抽象的物质或某一事件;substance指某种质地、形体、特征或重要性的东西,侧重某个实体,如:a mineral substance;Salt is a substance we use in cooking.
5. one of those who have witnessed the accident
解析:本题考查句型be one of... 与be the only one of...的辨析。但one前面有the only修饰时,从句中的谓语动词用单数,如:She is the only one of the girls who shows special aptitude in singing and dancing.
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