单项选择题

The author introduces Martin Hughes at the beginning of the passage ______.

A． to show he and his wife are both environmentally conscious
B． m serve as the background of his life story
C． to introduce the topic of "green tag"
D． to encourage the readers m follow suit

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单项选择题

Which of the following about the video game is true

A． Video games mainly teaches portion control and customer service.
B． Companies like video games because they can help their employees relax.
C． The market for corporate training games is enormous and it's growing fast.
D． The games will entirely replace traditional training methods.

单项选择题

Which of the following is not the consequence of prosperity

A． obesity rates have risen greatly.
B． more and more people are addicted to drugs.
C． divorce rates are rising.
D． consumers' preference for time-saving devices