侧根发生在根的（）。
A.表皮细胞
B.皮层细胞
C.中柱鞘细胞
D.韧皮部
E.形成层
参考答案：C
It took us quite a long time to get to the amusement park. It was _____ journey.[ ]
A. three hour
B. a three-hours
C. a three-hour
D. three hours
县级以上旅游行政管理部门依法对旅行社投保旅行社责任保险情况实施监督检查。( )
