【题目】There are ________ approaches to English teaching. But not all of them are equally efficient for our Chinese students.
A.variety
B.accurate
C.original
D.diverse

【答案】D
【解析】A．variety 名词，应说成a variety of；B．accurate准确的；精确的；C．original原始的；D．diverse不同的，多种多样的；句意：有许多英语教学方法，但它们不一定都对中国学生同样有效。根据句意，故选D。