A:①②
B:②③
C:①③
D:②④
新学期开始,在分配一些劳动任务时,老师常让女生擦桌椅、打扫教室卫生,而让男生搬桌椅、搬运新书。老师之所以这样分配是因为( )
In our school library there a number of books on science, and in these years the number of them growing larger and larger.