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12．Elephants have their own way to tell the shape of an object and __________ it is rough or smooth．（　　）

A．

that

B．

how

C．

whether

D．

what

分析大象有他們自己的方式來辨別物體的形狀和是否粗糙或光滑．

解答答案：C 考查從屬連詞．whether…or…意為"是…還是…；或者…或者…"，是固定搭配．故選C．其它選項不與or連用．

點評考查從屬連詞，弄清楚各種從屬連詞引導什么狀語從句，準確地理解句子、翻譯句子，然后根據句意選擇最合適的選項．

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