38. According to the passage, if you place an ad on TV, you are unable to know________
A) how often your ad is displayed
B) how much your ad costs
C)when your ad is shown
D) who your audience is
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39. If you market by e-mailing, you can learn within a day__________
A) who have opened your messages
B) how old your message readers are
C) what quality your advertised product has
D) how much your advertising messages cost
40.What enables the e-mail ad readers to do their own research?
A) The TV program ratings and reviews.
B) The product's color and size.
C)The electronic links.
D)The shopping carts.
python 自带的开发环境是( )
A. IDE
B. IDLE
C. Pycharm
D. Anaconda
Python 脚本的扩展名为( )
A. .py
B. .pj
C. .c
D. .po