1.What does the underlined word “it” refer to?

　　A.A type of icesalt mixture.

　　B.A newly found protein.

　　C.Fish blood.

　　D.Sugar molecule.

　　(2)

　　While the changes in the tail wagging were not easily noticed without the aid of video,it was thought that the findings could help people judge the mood(心情)of dogs.Computer and video systems,for example,could be used by professional dog trainers to determine the mood of dogs that they were required to approach.

　　2.The underlined word “they” refers to ____________.

　　A.the dogs

　　B.the trainers

　　C.the systems

　　D.the researchers

　　(3)

　　The president has started using look alikes during some public appearances.Dave is offered a chance to “serve his country” by becoming

　　one.

　　3.The underlined word “one” refers to ____________.

　　A.the President

　　B.the director

　　C.an actor

　　D.a lookalike

　　(4)

　　I regret that there are so few comfortable meeting places.You,re forced to live indoors.In Paris,I go out much more,to restaurants and nightclubs.To meet friends here it usually has to be in a pub,and it can be difficult to go there alone as a woman.The cafes are not terribly nice.

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