与血栓性血小板减少性紫癜发病机制有关的是（）
A.病毒感染
B.恶性肿瘤
C.药物
D.自身免疫性疾病
E.以上均是
参考答案：E
Hearing his travelling _______, I knew that he was an _____ traveller.
A．experiences; experienced
B．experience: experience
C．experiences; experiencing
D．experience; experienced
黑纳粉属于（）染料。
A、碱性
B、中性
C、酸性
D、油溶性
