世贸组织规则的特点是什么？
参考答案：
转化性、层次性、结合性、协调性、延伸性、介入性。
The flowers in the vase shriveled because they hadn't been watered for a week.
A．decreased
B．sweetened
C．died
D．shrank
简述促销工具——宣传的作用。
