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