These two words share similar meanings. Together they emphasize the intensity of amazement. Alternate translation: "They were greatly amazed" (See: [[rc://en/ta/man/translate/figs-doublet]])
The people ask this question to express their amazement. The question could be changed to an exclamation. Alternate translation: "All of these Galileans could not possibly know our languages!" (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-exclamations]])