黄疸的基本病机是（）。

Why is (71) fun What delights may its practitioner expect as his reward First is the sheer joy of making things. As the child delights in his mud pie, so the adult enjoys building things, especially things of his own design. Second is the pleasure of making things that are useful to other people. Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle cycles, playing out the consequences of principles built in from the beginning. Fourth is the joy of always learning, which springs from the (72) nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes (73) , sometimes theoretical, and sometimes both. Finally, there is the delight of working in such a tractable medium. The (74) , like the poet, works only slightly removed from pure thought-stuff. Few media of creation are so flexible, so easy to polish and rework, so readily capable of realizing grand conceptual structures.
Yet the program (75) , unlike the poet’s words, is real in the sense that it moves and works, producing visible outputs separate from the construct itself. It prints results, draws pictures, produces sounds, moves arms. Programming then is fun because it gratifies creative longings built deep within us and delights sensibilities we have in common with all men.

A．construct

B．code

C．size

D．scale

股票期货的优点包括( )。

A．交易费用低廉

B．卖空股票期货更便捷

C．具有杠杆效应

D．能进行单一股票的套利策略

银行业金融机构免除人民币个人账户的同城本行存款、取款和转账手续费这一规定中，“同城”范围指什么？

20，20，33，59，98，（）。

A．150

B．152

C．154

D．156

直流电的大小，方向都不随时间变化，而交流电的大小，向均随时间改变。（）