We can infer from the l^st paragragh that by "hit-or-miss" it is meant______.

A．Each page can be given a score that reflects its importance.
B．In the beginning of rating a page's relative importance, all pages are given the same score.
C．The importance of one page depends on the importance of pages that link to it, the importance of which depends in turn on the importance of pages that link to them.
D．One page's score is given totally to another page it links to.

A．managers should master modem technology
B．managers should have access to technological knowledge
C．managers should focus on functional tasks
D．managers should cooperate with technicians