危险化学品的零售业务范围不包括：______
A．爆炸品 B．易燃液体C．氧化剂D．腐蚀品
参考答案：A
分解因式：x2﹣4=( )．
There ______ a lot of red-crowned cranes in other parts of the world many years ago. [ ]
A. is
B. are
C. was
D. were
