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III. Match the words and expressions on the left with the explanations on the right:本大题共10小题,每小题1分,共10分。
21. mandate
22. specialization
23. incentive
24. infrastructure
25. the insured
26. biennial
27. contrac ting parties
28. optimal
29. prerequisite
30. claim
a. best or most favorable
b. something that incites, rouses or encourages a person
c. something required as a condition for something else
d. happening every altemate year
e. restricting one ' s economic activities to certain particular fields
f. a payment demanded in accordance with an insurance policy
g.a person covered by an insurance policy
h. authority given to perform a duty
i. signatories of an agreement
j. large -scale public services, such as water and power supplies , road，ail and radio communications, etc. needed to support economic activity, esp. industry, tnade and commerce
IV. Make brief explanations of the following terms or give the full name of the abbreviation in English:本大题共5小题,每小题2分,共10分。
31. tariff
32. voluntary offer
33. drawer
34. joint venture
35. CIF