四、阅读短文,回答问题
Do you play a musical instrument? If so,you may be getting smarter. A recent study is done these days.
Scientists studied 132 children in Canadian schools. At the beginning of the school year,these children took an IQ test. Then they were divided into four groups.
The first group took singing lessons. The second group took weekly piano lessons. The third group took classes in dramas. And the last group did no special activities at all. At the end of the school year,the 132 children took an IQ test again. In all four groups,the average(平均)score went up. However,the piano players' IQs went up 7.0 points on average. The average increase(增加)for the other three groups was only 4.3 points.
The researchers say that the difference is small and it may not result in better grades for the piano players. However,they still consider the results important. Learning an instrument helps kids become better at concentrating(专注)and at remembering things. Therefore(因此),the researchers say,it's ▲.
前3题每题的答案不超过10个词,第4题的答案词数不限。
1. Which group made the greatest progress according to the test result?
The second group.
2. What does the word "they" refer to(指代)in Paragraph 4?
The researchers.
3. How many times did the children take the tests?
Twice.
4. What words can be put into "▲"?
important/a good idea for kids to learn an instrument (if they want to be smarter)
解析：
翻译:
### 四、阅读短文，回答问题
你会演奏乐器吗？如果会的话，你可能会变得更聪明。最近有一项研究正在开展。
科学家们研究了加拿大学校里的132名儿童。在学年伊始，这些孩子参加了一场智商测试。然后他们被分成了四组。
第一组上唱歌课。第二组每周上钢琴课。第三组上戏剧课。最后一组则完全不参加任何特殊活动。在学年末，这132名儿童再次参加了智商测试。在所有的四个组中，平均分都有所提高。然而，学钢琴的孩子们的智商平均分提高了7.0分。其他三个组的平均分只提高了4.3分。
研究人员表示，这个差异很小，它可能不会让学钢琴的孩子取得更好的成绩。不过，他们仍然认为这个结果很重要。学习一种乐器有助于孩子们更善于集中注意力和记忆事物。因此，研究人员说，这是______。
前3题每题的答案不超过10个词，第4题的答案词数不限。
1. 根据测试结果，哪个组进步最大？______
2. 第4段中的“they”指代的是什么？______
3. 孩子们参加了多少次测试？______
4. 什么词可以填到“▲”处？______
