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53. The author writes this text mainly to .
A. introduce a few U.S. museums
B. describe some research work
C. discuss the value of an ape-man
D. report a coming event
54. What do the words "a replica" in Paragraph 2 refer to?
A. A painting of the skeleton.
B. A photograph of Lucy.
C. A copy of the skeleton.
D. A written record of Lucy.
55 How many cities has Lucy's U.S. tour plan already included?
A. Four.
B. Five.
C. Six.
D. Eleven.
56. What was the skeleton named after?
A. An ape-man.
B. A song.
C. A singer.
D. A camp
