Which is the major factor that made the difference between Wilmington and New Castle
A. Convenience for traffic.
B. The Delaware River.
C. The investment of Irenee DuPont.
D. The textiles mills.
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A computer is a machine' designed to（）
A. perform work mathematically
B. perform complicated calculations
C. store and select information
D. all of the above
What does the author mean by the word "progress" in this passage
A. Urbanization.
B. Economic growth.
Cultural development.
D. Increase of population.
We can conclude from the passage that using an electric car can ______.
A. save more money than using the regular cars in every way
B. prevent pollution and save energy in the long run
C. attract more customers to buy VSPs
D. soon lead to eliminating traditional cars
The difference in time between zones is（）
A. twenty-four hours
B. seven days
C. one hour
D. more than seven days
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