进出口许可证是国家管理货物进出口的凭证，不得买卖、转让、涂改、伪造和变造。
参考答案：对
Sometimes it's a bit challenging to reach a ________ between parents' expectations and their kids' desires.
A．commitment
B．comprehension
C．cooperation
D．compromise
卫生经济学产生和发展的条件。
