On average, a successful lawyer has to talk to several（）a da

A.has climbed

B.has been climbing

C.has been climbed

D.climbed

The notion of NP-completeness has provided a(66)mathematical definition for(67)intractability of NP problems. But this measure applies only to worst-case complexity. Being NP-complete does not(68)that a problem is intractable on the average case. Indeed, some NP-complete problems are "(69)on average", though some may not be. Levin initiated the study of average-case intractability, He showed that a bounded tiling problem under a simple distribution is average-case NP-complete. Since then, several additional average-case NP-complete problems have been shown within Levin's(70). This paper is intended to provide a comprehensive survey of average-case NP-complete problems that have been published so far, and the techniques of obtaining these results.

A．relaxed

B．rough

C．rigorous

D．feasible

A. employment

B. business

C. profession

D. occupation

In the absence of a special custom or the consent of the other interests in the adventure，the owner of deck cargo ______ claim for a general average contribution if it is jettisoned．

A.is not

B.has not

C.is no

D.has no

The STUDENT_GRADES table has these columns:The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this?（）

A.

B.

C.

D.

E.

F.

His brother has become a lawyer, ______ he wanted to be.

A. who

B. what

C. that

D. which

Helen loves to talk about travel. She _____ many places.

A. has gone to B. has been to C. has gone for D. has been from

One of the requirements for a general average act is ______.

A.a successful venture

B.no imminent peril

C.no losses

D.All of the above