总集
参考答案：指搜集两种以上文献，按一定理念和体例编校并冠以一个总名的著作。
_____ I do feel pity, I can’t really do very much to help them out of the difficulty.
A．As long as
B．As
C．while
D．Even
如何认识非洲大蜗牛的危害性？
