A:1
B:2
C:3
D:4
每当我想起父亲对我说过的他那______的童年,都使我倍加珍惜今天的美好生活,并催我进取。( )
若代数式x-2在实数范围内有意义,则x的取值范围是( )
John ________ play the guitar, but he wants to join the guitar club.
①糖类②脂肪③蛋白质④水⑤无机盐⑥维生素