[单选题]套筒扳手是用来拧紧或旋松有沉孔螺母的工具,由套筒和手柄两部分组成,套筒需配合螺母的( )选用。
A.大小
B.尺寸
C.体积
D.规格

Passage Two 　　Few numbers tell a happier story than those that measure life expectancy. An American born in 1900 could expect to live 47 years. Thanks to colossal improvements in sanitation and medicine, that figure is now 75 for men and 80 for women. 71 　　So it is both alarming and surprising when life expectancy falls, even for a small part of the population. Yet that is what some researchers at Harvard have found. They looked at death rates by county, having corrected for migration and merged sparsely populated ones so that America’s 3, 141 counties became 2, 068 “county units. ” 　　 72 But between 1983 and 1999, it fell significantly(by about a year)for women in 180 county units, and stagnated in another 783. Men fared less poorly: their life expectancy fell significantly in only 11county units, and stagnated in another 48. 　　Put differently, life expectancy appears to have either stagnated or fallen slightly for some 4% of American men and 19% of women. The
A. Another function of advertising is to communicate information about the product, its attributes, and its location of sale; this is the information function.
B. The forms that advertising takes and the media in which advertisements appear are as varied as the advertisers themselves and the messages that they wish to deliver.
C. An especially important issue in the creation of advertising is related to understanding how much information consumers want about a given product.
D. Advertising may influence consumers in many different ways, but the primary goal of advertising is to increase the probability that consumers exposed to an advertisement will behave or believe as the advertiser wishes.
E. Advertising also exists on billboards along the freeway, in subway and train stations, on benches at bus stops, and on the frames around car license plates.
F. The pervasiveness of advertising and its creative elements are designed to cause viewers to take note.