A. It is hard to tell how to protect the privacy of Internet users. B. Financial institutions cannot cope with criminal behavior. C. Internet has thousand passwords. D. Nobody knows your buying habits. 参考答案:A 答案解析:原文中有“How this information will be protected is one of the great unknowns.”一句。
第29题: [单项选择]扫描仪种类比较多,目前常见的家用扫描仪一般具有下面______特征。 ① 感光器件为CCD ② 感光器件为光电倍增管 ③ 扫描幅面一般为A4 ④ 接口一般采用USB ⑤ 扫描精度一般可以达到1200×2400dpi以上 A. ①③④⑤ B. ①③④ C. ②③④⑤ D. ②③⑥ 参考答案:B