Teachers have to constantly update their knowledge in order to maintain their professional ________．
A.consequence B.independence
C.competence D.intelligence
____ making decisions, the human brain cannot be compared with the computer because in the long process of evolution the slow pace of life didn't require such an ability of the human brain.
A. On behalf of B. In contrast to
C. In salute to D. In terms of
Either side seems to have a(n) _________ position; there are still many uncertainties on this issue.
A. ambiguous B. delicate C. explicit D. confidential
Though scientists get closer to understanding why we age， the reason for different aging rates among individuals remains only __________ understood．
A.concretely B.thoroughly
C.vaguely D.flexible
—Didn’t you have a good time at the party?
—Of course I did.As a matter of fact,I had such fun that time seemed to_____so quickly.
A.go by B.go away
C.go out D.go over
What shall we use for power when all the oil in the world has been _____？
A.given out B.put out C.held up D.used up
