题目：
IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.
A．extending
B．minimizing
C．demolishing
D．reducing
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错解析： 入境货物需对外索赔出证的，应在索赔有效期前不少于20天内向到货口岸或到达地检验检疫机构报检。
