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问题 选择题

Each of us _________ a new song at the last party. [ ]

A. were taught

B. teaches

C. was taught

D. teach them

答案

答案：C

单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(11) is a protocol that a host uses to inform a router when it joins Or leaves an Internet multicast group.
(12) is an error detection code that most data communication networks use.
(13) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.
(14) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non-periodic basis over a range of media.
(15) is an identifier of a web page.

A．ISDN

B．X.25

C．Frame Relay

D．ATM
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单项选择题

综采工作面所有安全出口与巷道衔接处（）m内，巷道高度都不得低于1.8m。

A、10

B、20

C、30

D、40
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