第18题: [单项选择]计算机病毒的特征之一是() A. 非授权不可执行性 B. 非授权可执行性 C. 授权不可执行性 D. 授权可执行性 参考答案:B
第19题: [单项选择]Neither of the young men who had applied for a position in the university ______. A. has been accepted B. have been accepted C. was accepted D. were accepted 参考答案:C 答案解析:[考点] 谓语动词。 [解析] 本题测试时态。neither指单数概念,可排除B、D两项。根据定语从句中使用过去完成时,主句应使用过去时,A排除。C正确。