Although she has a lot of problems，she manages to remain _____. [ ]

A. optimistic

B. cautious

C. concerned

D. anxious

再生障碍性贫血的口腔表征为（）

A.口腔黏膜苍白色，以唇、舌、龈明显

B.舌背黏膜广泛发红，呈鲜牛肉色

C.口腔黏膜苍白，并可出现瘀点、瘀斑或血肿

D.牙龈明显增生、肥大、水肿

E.牙龈炎，牙龈自发性出血