[单选题](单选题)
生理情况下
A.通气量和血流量均减少
B.通气量和血流量均增大
C.通气量增加,血流量减少
D.通气量减少,血流量增加
E.通气量和血流量分布不均

Digital photography is still new enough that most of us have yet to form an opinion about it, (1) develop a point of view. But this hasn’t stopped many film and computer fans from agreeing (2) the early conventional wisdom about digital cameras—they’re neat (3) for your PC, but they’re not suitable for everyday picture-taking.
The fans are wrong: More than anything else, digital cameras are radically (4) what photography means and what it can be. The venerable medium of photography (5) we know it is beginning to seem out of (6) with the way we live. In our computer and camcorder (7) , saving pictures as digital (8) and watching them on TV is no less practical—and in many ways more (9) than fumbling with rolls of film that must be sent off to be (10) .
Paper is also terribly (11) Pictures that are incorrectly framed, (12) , or lighted are nonetheless
A. in case
B. rather than
C. as well as
D. as though

Children in any society are expected to learn to conform to a number of social rules and expectations if they are to become participants in the culture. (46)Among the rules that children in our society are expected to learn are that certain classes of adults (such as teachers and doctors) are addressed by titles, that males and females use separate restroom facilities, and that women but not men wear dresses. These are examples of social conventions. In the absence of such a shared norm, the acts are neither right nor wrong. For this reason, conventions may be said to be arbitrary. For example, (47)we could just as easily have students address teachers by first names as have them call teachers by their last names and formal titles of Mr. or Ms.
Conventions, however, serve an important function by providing predictability and order to social life. (48)Without social conventions it would be impossible to organize social institutions such as schools, and soc