精选优质文档-倾情为你奉上A组20162014年各省市高考题（改编）Passage 1(2016全国)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Secret codes (密码)keep messages private.Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.People have used secret codes for thousands of years._1_ Code breaking never lags(落后) far behind code making.The science of creating and reading coded messages is called cryptography.There are three main types of cryptog
