What does the author mean by the word "progress" in this passage
A. Urbanization.
B. Economic growth.
Cultural development.
D. Increase of population.
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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
李某，男，30岁。右上齿痛2天，伴龈肿口渴，口臭，便秘，脉滑数。某医师予针灸治疗，取合谷、颊车、下关，还可取
A. 二间
B. 内庭
C. 外关
D. 太溪
E. 太冲
The mechanical energy can be changed back into electrical energy by means of a generator．（）
A. 通过发电机这种途径可以将机械能转变为电能。
B. 利用发电机可以将机械能转变为电能。
C. 借助于发电机可以把机械能返回电能。
D. 使用发电机这个方法能将机器产生的能量还原成电。
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