标准美语发音的13个秘诀 CD 4 Track 18（在线收听）

Exercise 8-4: Bit or Beat? Bid orBead?  CD 4 Track 18 

Read each column down. Next, contrast the singleand double tense vowels with each other; and the single and double lax vowels with each other. Finally read all four across.

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Note Bear in mind that the single/double intonation pattern is the same for all final voiced and unvoiced consonants, not just T and D.