贫血最常见的临床表现是（）
A.窦性心动过速
B.心脏杂音
C.皮肤和黏膜苍白
D.口腔炎，舌炎
E.毛发干燥无光泽，易脱落
参考答案：C
Half of _____surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears.
A．these
B．some
C．ones
D．those
将货躲上部两旁的出版物由下而上逐层缩小形成屋脊式，这种堆躲方法为（）
