Sarah ______ change her mind, even though she knew the plan was hard to carry out.

A. mustn’t B. wouldn’t

C. shouldn’t D. needn’t

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科目：高中英語(yǔ) 來(lái)源：2017屆重慶市高三7月月考英語(yǔ)試卷（解析版） 題型：閱讀理解

Some people like to listen to the Beatles．while others prefer Gregorian chants．When it comes to music , scientists find that nurture can overpower nature．

A study shows musical preferences seem to be mainly shaped by a person’s cultural upbringing and experiences rather than biological factors．“Our results show that there is a profound cultural difference in the way people respond to consonant(和諧的)and dissonant(不和諧的)sounds，and this suggests that other cultures hear the world differently,” says Josh McDermott．a(chǎn) scientist in Cambridge．

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The trick to working out where musical preferences come from was to find and test people who hadn’t had much contact with Western music．McDermott and his team travelled by aeroplane，car and canoe to reach the remote villages of the Tsimane’ people，who are largely isolated from Western culture．

In their experiments，McDermott and his colleagues investigated responses to Western music by playing combinations of notes to three groups of people：the Tsimane’ and two other groups of Bolivians that had experienced increasing levels of exposure to Western music．The researchers recorded whether each group regarded the notes as pleasant or unpleasant．

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