听力原文:M: Alan, do we have to listen to that? W: Why? Don't you like it? M: Er, no, not particularly. Can we have something more peaceful? What does the woman mean?
A.
She wants to keep quiet.
B.
She wants to have a peaceful life.
C.
She wants to have a nice evening.
D.
She wants to listen to some light music.
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【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
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