giúp tôi làm câu này??

To find the word whose underlined part differs from the other three in pronunciation, we need to analyze the given IPA notations. 1. A. chef: ʃɛf B. church: ʧərʧ C. chair: ʧɛr D. chore: ʧɔr The word "chef" has a different pronunciation for the "ch" sound, which is ʃ (a voiceless postalveolar fricative). The other three options have the "ch" sound pronounced as ʧ (a voiceless postalveolar affricate). So, the correct answer is A. chef. 2. A. school: skul B. headache: ˈhɛdeɪk C. character: ˈkɛrɪktər D. children: ˈʧɪldrən The word "school" has a different pronunciation for the "ch" sound, which is absent (the "ch" is replaced with "sk"). The other three options have the "ch" sound pronounced as ʧ (a voiceless postalveolar affricate), although in different positions. So, the correct answer is A. school.