美国科学家安德鲁·法尔和克雷格·格洛将双链RNA导入线虫细胞中，发现双链RNA能高效地特异性阻断相应基因的表达，他们因发现了RNA干扰机制而获得2006年诺贝尔奖。RNA干扰技术的应用不包括[ ]

A．抑制某些基因表达来改变细胞的分化方向

B．对目标基因进行表达阻断来推导该基因的功能

C．抑制癌细胞中相关基因表达以治疗癌症

D．研究信使RNA指导蛋白质合成过程

Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up （71） at the customer premise over slow （72） ports.PPP was designed to run directly over these serial links. But with the advent of broadband Internet（73） technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the （74） or cable "modem" over a much faster medium such as Ethernet. It also means that multiple （75） can connect to the Internet through the sameconnection.

A．buffer

B．modem

C． computer

D．server