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听力部分:
1-25 DCBCD ABABD ACBCA BCCDA DACDB
26. addition
27. recognize
28. challenges
29. identify
30. secret
31. specific
32. giving instructions
33. shed light on
34. acquisition
35. caught up with
n. 交换,兑换,交易所
v. 交换,兑换,交