9 The Texas Opera Theater was established as a subsidiary of the Houston Grand Opera in order to give young singers performing their experience.

　　A hall

　　B rival

　　C patron

　　D branch

　　10 Benjamin Franklin was not the first to suggest the relationship between lightning and electricity， but his experiment with a kite was original.

　　A define

　　B confirm

　　C examine

　　D propose

　　11 Louis Sullivan， a famous American architect， varied his structures to suit the local climate.

　　A modify

　　B enhance

　　C accommodate

　　D avoid

　　12 In statistics， the mathematical mean is obtained by dividing the sum of a group of scores by the number of scores.

　　A total

　　B square

　　C numerator

　　D list

　　13 Fortified medieval towns were often surrounded by two water moats.

　　A protected

　　B encircled

　　C flooded

　　D supplied

　　14 The future survival of the bald eagle is still an important American ecological concern.

　　A migration

　　B population

　　C existence

　　D evolution

　　15 The childrens story writer known as Dr. Seuss proved that the simplest stories for children could have characterization and suspense.

　　A structure

　　B history

　　C excitement

　　D plot

　　答案：1 B 2 A 3 B 4 B 5 D 6 A 7 C 8 A9 D10 D 11 C 12 A 13 B 14 C 15 D