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一、单项填空 1．I don’t think the experiment is ______ failure，because it has provided us with ______ valuable experience for our future tests. A．a；aB．a；/ C．/；/ D．/；a 解析：考查冠词。第一个空failure是可数名词，指“一件失败的事情”，故前面用不定冠词a；第二个空后的experience表示“经验”为不可数名词，故不用冠词。 答案：B 2．You ______ things about.Look，what a mess in your room! A．always throw B．have always thrown C．are always throwing D．have always been throwing 解析：考查时态。be always doing sth.表示“赞美，不满，责备”等语气，此处表示“不满”。句意：你总是乱扔东西。你看，你的房间内乱七八糟。 答案：C 3．Does it matter much ______ the sales manager won’t attend the meeting? A．if B．what C．when D．that 解析：that引导的从句是真正的主语从句。句意：销售经理不参加那个会要紧吗？ 答案：D 4．______ is known to us all is that the old scientist，for ______ life was hard in the past，still works very hard in his 80s. | 
