[单选题] When was Valencia the most important city in Spain?
A、2nd century
B、8th century
C、13th century
D、20th century
II. Vocabulary and Structure ( 15 points)6[单选题] __________John Adams who in 1775 recommended George Washington to be commander in chief of the Continental Army.
A、It was
B、That was
C、Although
D、When
[单选题] According to the passage, which of the following can be found in areas with quite different climatic conditions on Earth?