because it affects your pitch(音高)．”可知，B项正确。
【答案】 B
10．Which is the BEST title of the passage? A．Karaoke—Best Place for Singing! B．Christmas—Best Time for Singing! C．Singing—Healthy but not Easy! D．For health—Let's Sing!
【解析】 主旨判断题。根据文章第一段可知，本文观点为“Singing aloud will not just lift the spirits—it's good for your physical health as well.”，在接下来的几个部分又分别列举了Heart Research UK、Professor Graham Welch、Helen Astrid的研究发现，从而对文章观点进行进一步的论证。
【答案】 D
11．用30词左右概括文章大意
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【答案】 Singing is a strong aerobic activity whose benefits include making people feel happier，reduce stress and improve their self-respect.In a word，it can do good to both your spirits and your physical heath.