—What did the teacher say just now?

—Sorry. I didn't catch it. I _____ something else.[ ]

A. think

B. will think

C. was thinking

D. had thought

急性汞中毒的主要临床表现（）。

A.发热、口腔炎、消化道症状

B.贫血、腹痛、口腔炎

C.易兴奋、震颤、口腔炎

D.周围神经炎、皮疹、贫血

E.以上都不是