In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. In low - spee

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问题 In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
   In low - speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high - speed networks, this approach often works poorly, because in the(66)between sending the notification and notification arriving at the source, thousands of additional(67)may arrive. In ATM network, a major tool for preventing(68)is(69)control. When a host wants a new virtual(70), it must describe the traffic to be offered and the service expected.

选项 A、path
B、rout
C、circuit
D、way

答案C

解析 这里指虚拟的电路,所以只能选C
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