原题
录音 1
What can be inferred about the trumpet and the trombone?
AThey have clear ancestors to their modern versions.
BThey are often made of materials other than brass.
CThey do not yet have standardized versions.
DThey are not played in a similar way to the tuba.
正确答案：A
解题思路
老师暂未填写解题思路。