Unit9 I like music that I can dance to.SectionA (1a-2d)I. 单项选择:(BC 层学生必做,A 层选做或不做)( )1.Students love teachers ____________understand them.A. whomB. whoC. whichD. when( )2. This is the MP5 ___________mom gave me for my birthday.A. whatB. whenC. whoD. that( )3. Many young ...