1.Mark the letter A, B, C or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
A: exchange B: invite C: embroider D: economic
2.Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
A: crazy B: tidal C: volcano D: make