内蒙古温带草原地区和西北温带及暖温带荒漠地区的分界线大致（）

A．在阴山一带

B．相当于200毫米年降水量等值线

C．在祁连山一带

D．相当于400毫米年降水量等值线

While the examination is being carried out, ______ shall be present and responsible for moving the goods, opening and restoring the packing.

A. the consignee of the import goods and the consignor of the export goods
B. Customs officer
C. harbour officer
D. the owner of the ship