以下（）不是传统信用卡支付与网上银行卡支付系统的差别。

A．使用者不同

B．付款地点不同

C．信息传递通道不同

D．付款授权方式不同

Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide.

A．Devices

B．Hypotheses

C．Efforts

D．Suggestions