单项选择题

The 13 measures of psychological well-being are used to ______.

A．serve as the standards for choosing the subjects of the research
B．serve as the ways to help adults to get over their unhappy marriage
C．examine all the 5232 married adults
D．examine all the adults in the database
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单项选择题
According to Mary Meeker, ______.
A．traditional retailers can't compete with online ones on price, choice or service
B．the battle between traditional retailers and online retailers is over
C．online retailers have prevailed over traditional ones in the market of certain products
D．online retailers have destroyed the value of traditional retailers' properties
单项选择题
The cost of goods delivery brings about the result that ______.
A．distributing goods becomes troublesome and expensive
B．the notional price advantages of e-commerce are eliminated
C．old-fashioned warehouses and lorries have to be still in use
D．goods must be wrapped again and expensively returned
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