药材近江牡蛎的性状是（）

A.贝壳四方形，背缘平直，腹缘圆，单壳

B.贝壳呈长片状，背腹缘儿平行，右壳较平，左壳凹陷很深

C.贝壳呈类三角形，背腹缘呈八字形。右壳外淡黄色

D.贝壳呈圆形、卵形或三角形，右壳较小，表面环生同心鳞片

E.贝壳呈类三角形，背腹缘呈八字形。右壳外淡黄色，内面红黄色

software design is a (111) process．It requires a certain (112) of flair on the part of the designer.Design can not be learned from a book．It must be practiced and learnt by experience and’study of existing systems.A well (113) software system is straightforward to implement and maintain，easily (114) and reliable.Badly (115) software systems，although they may work are (116) 2 to be expensive to maintain，difficult to test and unreliable．

A．create

B．created

C．creating

D．creative