All of the other members live in the South American country of Bolivia. One group lives in the capital city of La Paz. They hear Western music, but probably not as much as people living in North America do. Another group comes from the small town of San Borja. Its residents (居民) probably hear even less Western music than the people in La Paz do.

　　The final group - the Tsimané-live in a village within the Amazon rainforest. It is so far away that outsiders can reach it only by boat. When they sing or play instruments，they do it by themselves. This sets their music apart from the kinds of sounds typical in Western music.

　　 The people in all five groups listened to recordings of chords (和弦). Some chords were consonant. That term refers to musical sounds that most people consider pleasant to hear. Others were dissonant.

　　 As expected, U．S. residents strongly preferred consonant chords. People in La Paz and San Borja also preferred consonance over dissonance. But the Tsimané liked them equally. What's more, how strongly people preferred consonant chords was linked to their exposure (曝光) to Western music. U．S. residents who had played a musical instrument preferred consonant chords most. Those in San Borja preferred them least. And the Tsimané？ They showed no preference for either.

　　【文章大意】　本文为说明文，题材为日常生活类。研究发现人们对某种音乐的偏爱跟他们经常听什么音乐有关。

　　1．What do the people in the first two groups have in common?

　　A．They all love various kinds of music.

　　B．They are all often exposed to Western music.

　　C．None of them have listened to foreign music.

　　D．They have played music for less than a year.

　　解析：B　细节理解题。根据第二段的Two of the groups live in the United States. They listen to Western music可知，这两组人是美国人，经常听西洋音乐。

　　2．Why did the researchers work with the Tsimané？

A．Because they were good at music.