对比观测的目的是什么？

请选出下列句子中加粗词语运用有误的一句   [ ]

A．游戏是儿童最正当的行为，玩具是儿童的天使。  

B．在人类进化过程中，劳动是一个必须的过程。  

C．聪明的资质、内在的干劲和敬业乐群的态度，都是科学研究的必备条件。  

D．追求梦想，与其下一百次决心，不如付诸一次行动。

痫病之痰具有的两大特点是（）

A.阻滞气血运行

B.影响水液代谢

C.随风气聚散

D.胶固难化

E.致病面广，变幻多端

下列药物，对高肾素型高血压有特效的是（）

A.尼群地平

B.卡托普利

C.氢氯噻嗪

D.肼屈嗪

E.二氮嗪

DR相比于CR（）

A.成像时间短

B.X线利用效率高

C.图像质量好

D.系统成本高

E.以上都是

Why is ______ 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 ______ nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes ______, sometimes theoretical, and sometimes both. Finally, there is the delight of working in such attractable medium. The ______, 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 ______, 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．programming
B．composing
C．working
D．writing