正确答案: B

题目：设A和B为两事项件，0<P(A)<1，则下述结论中错误的是（　　）

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学习资料的答案和解析：

[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。

[多选题]参于脑干组成的有 （　　）

中脑

脑桥

延髓