_____, he makes little progress. So he is trying new methods of study. Which of the following is WRONG? [ ]

A. Hard as he works

B. Hard although he works

C. Hard though he works

D. Although he works hard

下列哪一项不属于听诊检查内容（）。

A.动物心音状态的检查

B.动物支气管呼吸音的检查

C.动物肺泡呼吸音的检查

D.动物胃肠蠕动情况的检查

E.动物膈肌痉挛音的检查