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B.to exemplify why New Eras of the past failed
C.to justify the profitability of Internet business
D.to explore the prosperity and decline of New Eras
27.It is implied in the passage that ______.
A.most Internet companies are unlikely to be out of business soon
B.after beating the competitors,the survived Internet companies can achieve some
meaningful earnings
C.the growth of the Internet businesses is too fast
D.the spread of a new invention can make people live better
28.The current booming of Internet industry is compared to _______.
A.ice in the Arctic
B.sand in the desert
C.seawater in the ocean
D.a Klondike-style gold rush
29.All the following account for the letdowns of New Eras of the past EXCEPT ______ .
A.the emergence of imitation after innovation
B.the competition between imitation and innovation
C.even greater innovation after great invention
D.exclusive intervention by the government
30.The Erie Canal is mentioned in the passage because ______.
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