—     ! I left my wallet in the desk and now it’s still here.

—Lucky you! You should take good care of your things.

A．Well done

B．Best wishes

C．Thank goodness

D．My pleasure

过敏性紫癜的特征性临床表现是（）

A.起病前1～3周常有上呼吸道感染史

B.突发恶心，腹痛或便血

C.双下肢对称性皮肤紫癜反复出现

D.关节肿痛

E.出现蛋白尿或血尿