精子肉芽肿是（）
A.自身免疫性疾病
B.肿瘤性病变
C.炎症性病变
D.睾丸最常见的病变
E.以上均不正确
参考答案：C
William found it increasingly difficult to read, for his eyesight was beginning to ________.[ ]
A. disappear
B. fall
C. fail
D. damage
