AB
times their own weight everyday.
___ _____
CD
31 . The novels of Pearl S. Buck show a keen understanding of China and the Chinese
____ ____
AB
people, knowledge which learned by living there for many years.
___________________ C D
32. North America has eight time zone, ranging from Newfoundland on the East Coast
__ ___ _____
A BC
to Alaska on the West Coast.
__
D
33. Historians believe that some forms of an advertising must be as old as barter and
__________________________
A BC D
trade.
34. Although fluorine tests and x-ray analyses, archaeologists can prove the validity of
_______ __________ _____
A BCD
artifacts.
35. Dams are used to control flooding, provide water for irrigation, and generating
______________________
A BC
electricity for the surrounding area.
___
D
36. The development of photographic techniques and equipment provided an important
_______ _________
AB
aid to industry, medical, and research.
________
C D