阅读短文，从方框中选出恰当的单词并用其适当形式填空，使短文通顺、意义完整。每空仅填一词，每词仅用一次。
ill while simple focus beat two long feel social go
Music helps us exercise, but why does it have this effect? Scientists say there are two main reasons.
The first is 1. : Music distracts us. When we listen to a song we like, our brain 2. on the music. For example, after we exercise for 20 minutes, our body may feel tired. But we might not notice it right away because we are listening to the music. As a result, we can exercise a little 3. .
Music can motivate(激励) us as well. When we hear dance music, we naturally start to move to the 4. . An upbeat song also puts us in a good mood. This gives us energy and helps us keep 5. .
However, a new study by scientist Tom Fritz suggests this is only part of the explanation. In an experiment, Fritz put 61 people in small groups. They all exercised 6. . The first time, each group worked out for six minutes 7. listening to music. The second time, they exercised for six minutes on special "Jymmin" machines. The name Jymmin is a combination of "jammin(即兴演奏)" and "gym". Using these machines, the groups made their own music as they moved. At the end, 53 of the 61 people said the same thing: They 8. less tired when they used the Jymmin machines.
How does Fritz explain this? Maybe people did better on the Jymmin machines because they had more control, he says. The people created the beat. They could make it go faster or slower. Also, the activity was 9. . Each group was making music together and having fun, Fritz believes that Jymmin exercise may have other benefits, too. He wants to find out if it can help with some 10. . For example, it might even be a good way to treat depression.

1. simple 2. focuses 3. longer 4. beat 5. going 6. twice 7. while
8. felt 9. social 10. illnesses

【分析】
本题为选词并用适当形式填空题型，解题思路为：首先通读短文，理解短文主旨（音乐助力锻炼的原因）；接着逐个分析每个空的语境、所需词性、语法规则（如主谓一致、时态、固定搭配、比较级等），从方框给定单词中选取合适词汇并调整为正确形式；最后验证答案是否符合短文逻辑。
【解析】
1. 第一空：后文提到音乐分散注意力，这是第一个简单的原因，需形容词作表语，选simple。
2. 第二空：主语our brain为第三人称单数，短语focus on（专注于），一般现在时，故填focuses。
3. 第三空：因听音乐未察觉疲劳，能锻炼更久，需副词比较级，选longer。
4. 第四空：dance music对应的是节拍，名词beat，符合语境，填beat。
5. 第五空：固定搭配keep doing sth.（坚持做某事），选go，变为动名词going。
6. 第六空：后文提到first time和second time，可知是两次，选two，变为twice。
7. 第七空：while引导时间状语，表“当……时”，省略主语和be动词，填while。
8. 第八空：全文为一般过去时，feel的过去式为felt，填felt。
9. 第九空：后文提到各组一起做音乐，需形容词表“社交的”，选social。
10. 第十空：some后接可数名词复数，ill的名词为illness，复数形式illnesses，填illnesses。
【答案】
1. simple 2. focuses 3. longer 4. beat 5. going 6. twice 7. while 8. felt 9. social 10. illnesses
【知识点】
英语词汇运用、动词时态、形容词副词比较级
【点评】
本题考查选词填空，需结合语境、语法规则及固定搭配解题，是初中英语基础题型，侧重词汇的灵活运用，难度适中。
【难度系数】
0.6