单项选择题

The thing that most e-commerce customers are concerned about is ______

A．their own online experience
B．brand performance
C．their decision to purchase
D．percentage of the issues
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单项选择题
What does the phrase vis-a`-vis exactly mean in the first sentence of the second paragraph
A．"with a view to"
B．"in response to"
C．"in comparison with"
D．"in opposition against"
单项选择题
The rats fed unrestricted diets do NOT ______
A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased
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