Accordingtotherecentreports,oneoftheanimals,_____crocodile,isin_____dangerofdyingout.
A.the; theB.the; /C./; /D./; the在线课程B
解析：
第一空是定冠词the+可数名词的单数形式，表示类别，第二空是固定词组in danger“处境危险”，类似的零冠词现象的词组有：at war, at peace, at table, at work, at college, at sea, by force, by air, by sea, by train, in bed, in hospital, in peace, in ink, on foot, on sale, on leave, on fire, on business, in public, in secret等。