下列句子中，加粗的词语使用恰当的一项是[ ]

A、班会课上，他夸夸其谈，出众的口才使大家十分佩服。

B、目前，住房价格一涨再涨，令购房者叹为观止。

C、听到这个幽默的故事，他忍俊不禁地笑了起来。

D、日本首相小泉肆无忌惮地参拜靖国神社，激起了亚洲各国人民的极大愤慨。

Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up. (6) at the customer premise over slow (7) ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet (8) 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 (9) or cable "modem" over a much faster medium such as Ethernet. It also means that multiple (10) can connect to the Internet through the same connection.

（7）是（）

A.parallel

B.digital

C.serial

D.variable