A professor of biology gave a talk to more than 1000 students on elephants living conditions and the dangers _______ them. 
A．faceB．facingC．facedD．a(chǎn)re facing
B
考查非謂語(yǔ)動(dòng)詞。facing them作定語(yǔ)，修飾living conditions and the dangers，故選B。
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