It is ______ he often fails in exams ______ makes his parents worried about him.

A． what, that

B． that, what

C． that, that

D． /, that

疟疾引起的黄疸是（）。

A.肝细胞性黄疸

B.溶血性黄疸

C.梗阻性黄疸

D.先天性黄疸

E.生理性黄疸