现代鸡品种是指经有目的、有计划的系统选育，按育种组织制订的标准鉴定承认的，并列入标准

A kite made of silk _____ easily in weather with rain and strong winds. [ ]

A. isn't tom

B. doesn't tear

C. won't be torn

D. can't tear

I hope there is _______ with my eyes.[ ]

A. nothing wrong      

B. wrong nothing

C. anything wrong    

D. wrong something

与钙代谢相似的放射性物质是（）

A.锶

B.铯

C.钾

D.碳

E.碘

郑声的病机是( )

A．宗气大虚
B．心气虚弱
C．神气不足
D．痰扰神明
E．脏气衰微，心神散乱

人流综合征诊断要点。（）

A.临床表现为恶心、呕吐、头晕、胸闷、气喘、面色苍白、大汗淋漓、四肢厥冷等

B.心律不齐

C.血压下降

D.严重者可出现一过性意识丧失、晕厥、抽搐。