题目

被虫蛀过的种子，一般不能萌发的原因是（ ）。 A.种子被细菌感染     B.种子的胚被咬坏 C.种皮被破坏         D.种子萌发的环境条件不适宜 答案：BIt is reported that the police will soon ________ the case of the two missing children. A. look upon                    B. look after                  C. look into                       D. look out