题目内容
Passage Three
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Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. The conversation and question will be spoken only once. During the pause, you must read the four choices marked A, B, C, D, and decide which is the best answer. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center.
下述关于胆囊的超声检查，哪一项属于胆囊结石（）。
MP3是目前最流行的数字音乐压缩编码格式之一，其命名中“MP”是指 (1) ，“3”是指 (2) 。
Passage Three
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