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；a B．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。
