【单选题】请阅读Passaqe l,完成第21~25小题。 Passage 1 Among the throngs of Americans prowling the malls and trawling e-commerce sites, many are looking out for themselves. Retail-research firm NPD Group said, thus far, ...
A.
It hasn't helped improve balance sheets.
B.
It is an age-old practice for most Americans.
C.
It has been on the rise since the recent recession began.
D.
It has reflected the American tradition of self-abnegation.