题目内容

______(他别无选择只好换专业)since he discovered that he had little talent for programming．

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If it had not been for your help, I (not finish)____________the work so easily.

We all like him because he has a great (sensitive)____________of humor.

A—Letter of Credit B—discounting
C—international transactions D—beneficiary
E—document of title F—acceptance
G—negotiable instrument H—guarantee
I—draft J—shipping document
K—default risk L—bill of lading
M—maturity N—foreign exchange risk
O—term of payment P—currency
51. ()收益人 ()到期
52. ()海运提单 ()信用证
53. ()外汇风险 ()国际交易
54. ()付款条件 ()保证
55. ()承兑 ()物权凭证

请简要说明各范式之间的关系。(文字和图标形式皆可)