[简答题]Now that saying is being turned on its head as America undergoes a transformation from a society for youth into a nation in which middle-aged and elderly people set the pace by mere force of number.

[简答题]Now that saying is being turned on its head as America undergoes a transformation from a society for youth into a nation in which middle-aged and elderly people set the pace by mere force of number.

[填空题]its being return or replacement.

[单项选择] The mystery had now reached its climax: the man had undoubtedly been murdered, and it was absolutely certain no one could conceivably have done it. It was therefore time to call in the great detective, who gave one searching glance at the corpse, then produced a microscope. "Aha!" he exclaimed as he picked a hair off the lapel of the dead man’’s coat." The mystery is a mystery no longer. We have only to find the man who lost this hair, and the criminal will be in our hand." The inexorable chain of logic was complete, and the detective embarked on his search. For four days and four nights he moved unobserved through the streets of New York, scanning closely every face he passed, looking for a man who had lost a hair. On the fifth day he discovered a man disguised as a tourist, his head enveloped in a cap reaching below his ears. The man was about to board the Gloritania, and the detective lost no time in following him on board. "Arrest him!" shouted the detective, and the
A. found the hair
B. produced the microscope
C. searched for the murderer
D. glanced at the corpse

[单项选择]