某公司拥有机动船15艘(其中10艘的净吨位为600吨，5艘的净吨位为2 000吨)，拥有非机动船10艘(其中载重吨位为10吨的6艘，载重吨位为20吨的4艘)。拥有渔船5艘，其中2艘载重量为0.8吨，3艘载重量为1.4吨。已知，机动船501-1 500吨每净吨位的年税额为2.2元，1 501吨至3 000吨每净吨位为3.2元，非机动船10吨以下每载重吨位为 0.6元，11-50吨每载重吨位为0.8元。
要求：计算该公司应该缴纳的车船使用税。

Extreme Programming (XP) is a discipline of software development with (71) of simplicity, communication, feedback and courage. Successful software development is a team effort-not just the development team, but the larger team consisting of customer, management and developers. XP is a simple process that brings these people together and helps them to succeed together. XP is aimed primarily at object-oriented projects using teams of a dozen or fewer programmers in one location. The principles of XP apply to any (72) project that needs to deliver quality software rapidly and flexibly.

An XP project needs a(an) (73) customer to provide guidance. Customers, programmers, managers, are all working (74) to build the system that’s neede

D．Customers-those who have software that needs to be developed-willleam simple, effective ways to (75) what they need, to be sure that they are getting what they need, and to steer the project to success.

（73）（）

A．part-time

B．casual

C．seldom

D．full-time