听力原文:M: I can't decide whether to buy a new ear or try to find a second hand one. W: If you buy a new one, you'll probably save money in the long run. What does the woman advise the man to do?
A.
To save money.
B.
To run.
C.
To buy a secondhand car.
D.
To buy a new ear.
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参考答案:
举一反三
【多选题】Which three statements are true about the Internet Group Management Protocol (IGMP)? ()
A.
There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode
B.
IGMP is used to register individual hosts with a multicast group
C.
IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from
D.
IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1
E.
IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP