choose the word whose underlined part is pronounced differently from that of the others: A. really B. reason C. teaching D. speaking

To determine which word has the underlined part pronounced differently from the others, we need to examine the IPA notations for each word. The underlined part refers to the ending sound of each word. Here are the IPA notations for each word with the ending sound underlined: A. really: ˈrɪl**i** B. reason: ˈrizə**n** C. teaching: ˈtiʧɪ**ŋ** D. speaking: ˈspikɪ**ŋ** Comparing the ending sounds, we can see that "really" ends with the "i" sound (ˈrɪl**i**), while the other three words end with different sounds: "n" (ˈrizə**n**), "ŋ" (ˈtiʧɪ**ŋ** and ˈspikɪ**ŋ**). Since the ending sound of "reason" (ˈrizə**n**) is pronounced differently from the others (which are either "i" or "ŋ"), we might be inclined to think it's the correct answer. However, looking closer, the actual correct answer is A. really, since the "i" sound is different from the "n" and "ŋ" sounds. Therefore, the correct answer is A. really.