第12题:[单项选择]<br><br><br/>A.from<br/>B.of<br/>C.out<br/>D.in<br/>参考答案:D 答案解析:此题考查数词的表达法。这里显然是一个比例数字,即三分之一。英文中表示比例的说法介词可以用in和out of。例如“三分之二”就是two in three或者two out of three。当然,也可
第20题: [单项选择]The quantum theory states (), such as light, is given off and absorbed in tiny definite units called quanta or photons. A. energy that B. that it is energy C. it is energy D. that energy 参考答案:D 答案解析: