Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.     
A．不填B．whetherC．howD．Which
B
主要測試賓語從句。結(jié)合語境可知動詞tell后面需要接兩個賓語另外句子中存在連接詞and。再結(jié)合平時的知識：和or連用的引導(dǎo)詞是whether。句子意思：大象有它自己辨別物體形狀及物體是粗糙還是光滑的方法。
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