单项选择题

Based on the essay, which of the following sentences is the best conclusion about the characteristics of a successful inventor

A．The person must be fascinating and interesting to other people.
B．The person must be relaxed and able to work long hours.
C．The person must go to specialized schools to learn the necessary skills.
D．The person must be persistent and ambitious about inventing.
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单项选择题
What conclusion can be drawn from the essay about the United States during the time of Henry Ford's youth
A．Horse-drawn carriages were used as a popular means of transportation.
B．Most people were tired of horse-drawn carriages and wanted a better way to travel.
C．the assembly line made it more difficult for people to invent new products.
D．Many inventors were trying to invent a fast and comfortable way to travel.
单项选择题
What do the words remain stationary mean in sentence 1, paragraph 4 of the passage
A．move from one place to another
B．stay in one place and not move
C．move in two directions
D．stay in more than one place
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