【简答题】How to Get Preserved as a Fossil 56. Unfortunately the changes of any animal become a fossil are not very great, and 57. the chances of a fossil then being discovered many thousand of years later are ...
【单选题】Most people experience computers as 'end-users' of packaged programs. Unfortunately the writers of these programs can't know the details of the job you are trying to do. Trying to meet the needs of di...