资料1：报关单
中华人民共和国海关进口货物报关单






请根据以上资料，选择下列栏目正确选项：

“备案号”栏应填（）。

单项选择题It is essential that you ______ competitive prices.

单项选择题In the foreign trade business, the trade terms CFR is often used. CFR is the abbreviation for （）.

A. Commercial Invoice
B. Cost, insurance and freight
C. Cost and freight
D. Carriage paid to