四、根据句子描述，从方框中选出对应的乐器，将序号填在相应的横线上。
A. A triangle.
B. A piano.
C. A violin.
1. It has a big body. It has many keys. They're black and white. You can use it to play music. What is it?
2. It has a long body. It's brown. It has four strings. They're thin and long. You can use it to play music. What is it?
3. It has three sides (边). You can hit it to make nice sounds. What is it?

1. B 2. C 3. A

【分析】本题需根据每个句子描述的乐器特征，匹配方框中对应的乐器选项。首先提取每道题的关键特征，再对应选项中的乐器名称，最后填入正确序号。
【解析】1. 句子描述“有大身体、黑白键”，对应乐器是钢琴，即选项B；2. 句子描述“长身体、棕色、四根弦”，对应乐器是小提琴，即选项C；3. 句子描述“三条边、敲击发声”，对应乐器是三角铁，即选项A。
【答案】1.B 2.C 3.A
【知识点】英语乐器词汇、句子理解
【点评】本题考查常见乐器的英文表达及特征理解，属于基础匹配题，需掌握基础的乐器类英语词汇。
【难度系数】0.8

五、通过本单元的学习，你喜欢上什么乐器了？你会演奏哪种乐器呢？
What musical instrument do you like? What musical instrument can you play?

I like pianos. I can play the piano.
(答案不唯一)

【分析】这是英语日常情景问答题，需根据问题分别回答喜欢的乐器和会演奏的乐器，注意英语中表达“喜欢某物”用like + 名词，“演奏乐器”用play the + 乐器的正确形式，答案不唯一，符合日常表达即可。
【解析】针对问题，分别给出喜欢的乐器和会演奏的乐器的英语回答，示例为：I like pianos. I can play the piano.
【答案】I like pianos. I can play the piano.
【知识点】英语情景交际、乐器的英语表达
【点评】本题考查日常英语基础问答，贴近生活，难度较低，学生易掌握。
【难度系数】0.8