题目内容

心瓣膜病最常累及的瓣膜是

A. 主动脉瓣和三尖瓣
B. 二尖瓣和主动脉瓣
C. 三尖瓣和肺动脉瓣
D. 二尖瓣和三尖瓣

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Listen carefully and choose consonant cluster you hear.

A. / tr/
B. /ts/
C. /dr/
D. /dz /

Listen carefully and choose the word you hear.

A. tents
B. tends
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D. fends

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B. worst
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A. 对
B. 错