B.Increased immigration.
C.Economic downturn.
D.Social instability.
59、 What accounted for Americas baby boom?
A.Optimism for the future.
B.Improved living conditions.
C.Religious beliefs.
D.Economic prosperity.
60、 Why do people in wealthy countries prefer to have fewer children?
A.They want to further improve their economic well-being.
B.They cannot afford the time and expenses of rearing children.
C.They are concerned about the future of the coming generation.
D.They dont rely on their children to support them in old age.
61、 What is the authors purpose in writing the passage?
A.To instill confidence in the young about raising children.
B.To advise couples to think twice before having children.
C.To encourage the young to take care of the elderly.
D.To appeal for tax reduction for raising children.
62、 Questions 62-71are based on the following passage.
Space exploration has always been the province of dreamers: The human imaginatio readily soarswhere human ingenuity (创造力) struggles to follow. A Voyage to the Moon, often cited as the firstscience fiction story, was written by Cyrano de Bergerac in 1649. Cyrano was dead and buried for a goodthree centuries before the first manned rockets started to fly.
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