19.Questions19to21arebasedonthepassageyouhavejustheard.
A) Why dogs can be faithful friends of humans.
B) The nature of relationships between dogs.
C) The reason a great many people love dogs.
D) How dogs feel about their bonds with humans.
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20.
A)Theybehavelikeotheranimalsinmanyways.
B)Theyhaveanunusualsenseofresponsibility.
C)Theycanrespondtohumans'questions.
D)Theycanfallinlovejustlikehumans.
21.
A)Theystaywithonepartnerforlife.
B)Theyhavetheirownjoysandsorrows.
C)Theyexperiencetrueromanticlove.
D)Theyhelphumansinvariousways.
Questions22to25arebasedonthepassageyouhavejustheard.
A)Arareanimal.
B)Ahistoricalsite.
C)Acowbone.
D)Apreciousstone.
23.
A)Datingit.
B)Preservingit.
C)Measuringit.
D)Identifyingit.
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