An officer is allowed to ask general information questions without reading your Miranda Rights since the only requirement for being read your rights in a DUI arrest comes after the arrest (usually the cuffs going on and further questioning). This means that unfortunately, the officers will try to find out as much information as possible to bolster their case before making the arrest.
Once they make the arrest after gathering the initial information is when you are allowed to choose a blood or breath test, which you are required to take or face losing your license for an extended period. Additionally, your Miranda Rights only protect the dissemination of non-voluntary information, which means that if you voluntarily tell the officer something, it can be used against you.