正确答案: ABCD

心音有4个 通常只能听到S1和S2 某些健康儿童和青少年可闻及S3 S4一般听不到

题目：关于心音的听诊，下列正确的是（　　）

解析：略

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学习资料的答案和解析：

[单选题]1948年12月30日，毛泽东在以下哪篇文章中首次公开使用“人民民主专政”的概念（　　）

《将革命进行到底》

解析：历史知识，要记住。

[单选题]提出社会主义初级阶段党的基本纲领是在（　　）

党的十五大

解析：党的十五大根据社会主义初级阶段 基本路线的要求，围绕社会主义现代化建设的总 目标，制定了党在社会主义初级阶段的基本纲领， 故选“C”。

[单选题]What job will be done the day before the festival begins?

回答下面的题目Student Volunteers Needed!On Saturday, December 12th,from 10 A．M．until 4 P． M． , Carverton Middle School will be holding a music festival in the school gymnasium． The special event will feature a variety ofprofessional musicians and singers．TaskTimeDateMake posters1 P．M．一4 P．M．December 5thSet up gym11 A．M．一4 P．M．December 1thHelp performers9 A．M．一4 P．M．December 12thWelcome guests10 A．M．一2 P．M．December 12thClean up gym4 P．M．一7 P．M．December 12thInterested students should speak with Ms．Braxton,the music teacher．Students who would like to help at the festival must have written permission from a parent or guardian．What time will the festival begin?

Setting up the gym．

解析：音乐节的头一天应该做什么。12日举行音乐节，头一天应是11日。表格的第二行，把体育馆布置好。选项B是正确的。

[单选题]__________

根据以下内容，回答下面的题目。The death of a child, _51_ one’s own child,is something the mind can hardly comprehend．It seems togo _52_ nature．The end of a life that is still forming_53_ has just begun is an almost unthinkable cruelty．But it happens．Parents sometimes must witness the illness and death of the children_54_ whom they gave birth．And _55_ will ever fill theempty place that the dead child leaves behind．Parents_56_ to die before their children, which is the natural order of life events．When the situation is reversed and a child dies _57_ the parents itseems wrong．Yet we never know why one person dies andanother lives．But we do know _58_ a child is gone, theparents still have a future, as grey and worthless as it may at first seem．Death may take the child, but the love never _59_．The sorrow after a child’s death is one ofthe longest and hardest type of _60_ to live with．And ittakes long to deal with the parents’ own emotions．__________

nothing

[单选题]四名学生和两名教师排成一排，若教师不相邻且不排在两端，则不同的排法有（　　） (A)72种(B)96种 (C)144种(D)240种