题目

Private taxi booking apps have ______ like mushrooms in the past few months because of their convenience and high efficiency. A . broken up； B . lined up； C . come up； D . sprung up 答案：D 人体精子和卵细胞结合形成受精卵的部位是 [　　] A．输精管 B．输卵管 C．子宫 D．卵巢