第30题: [单项选择]强化常出现双轨征的病变是() A. 视网膜母细胞瘤 B. 视神经脑膜瘤 C. 炎性假瘤 D. Graves病 E. 泪腺癌 参考答案:B
第31题: [单项选择]Theories have features that are (indicative) of their truth, and the. task of justification is to identify these features and (using them) to guide choices (as to) (which theories) to believe A. indicative B. using them C. as to D. which theories 参考答案:B 答案解析:[解析] 此处为(to)+动词原形。