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　　1 The Mayan civilization flourished on the Yucatan peninsula of Mexico. 

A profited B gained C benefited D prospered 

2 The field of international finance involves policies and procedures that affect the flow of money and credit among countries. 

A appraisal B numeration C availability D circulation

3 When an electric current flows through a wire, a magnetic field appears around the wire. 

A travels B vibrates C alternates D fluctuates

4 It was difficult to see ships in the distance because of the fog. 

A sweat B haze C dew D frost

5 Many tourists are attracted to the New England states by the autumn foliage. 

A weather B leaves C festivals D harvest 

6 Though chess players may now compete against computers, they still follow rules that were used over 800 years ago. 

A come after B abide by C recite D allow

7 The harpsichord, developed during the Middle Ages, was one of the forerunners of the piano. 

A competitors B imitators C predecessors D offspring 

8 Strict sanitary procedures help to forestall out-breaks of disease. 

A prevent B control C minimize D preview

9 Even the best-build machine will not run forever without proper maintenance. 

A eternally B smoothly C dependably D accurately

10 For financial reasons, scientists are often compelled to forsake their research. 

A extend B resume C abandon D redirect

11 Archaeologists have discovered fossils of million-year-old animals in excavations. 

A remnants B graves C records D paws

12 The oldest preserved manuscripts are those written on papyrus, which were found in Egyptian tombs. 

A protected B hidden C sought D discovered 

13 Mary frosted the cake.

A served B iced C split D cooled

14 In the first decades of the twentieth century, the individual gene could not be seen, but could be worked with fruitfully. 

A blindly B completely C productively D carefully

15 Grounded whales often struggle fruitlessly to reenter deep water. 

A violently B desperately C in vain D at length

答案：1. D2. D3. A4. B5. B 6. B7. C8. A9. A10. C11. A12. D13. B14. C15. C