单项选择题

现有：1.classBook{2.privatefinalvoidread（）{System.out.print（"book"）；}3.}4.classPageextendsBook{5.publicstaticvoidmain（String[]args）{6.//insertcodehere7.}8.privatefinalvoidread（）{System.out.print（"page"）；}9.}和如下三个代码片段（x，y，z）：x.//justacommenty.newPage（）.read（）；z.newBook（）.read（）；分别插入到第6行，有几个允许代码通过编译并可以运行且无异常？（）
A.0
B.1
C.2
D.3

A.classBook{2.privatefinalvoidread（）{System.out.print（"book"）；}3.}4.classPageextendsBook{5.publicstaticvoidmain（String[]args）{6.//insertcodehere7.}8.privatefinalvoidread（）{System.out.print（"page"）；}9.}和如下三个代码片段（x，y，z）：x.//justacommenty.newPage（）.read（）；z.newBook（）.read（）；分别插入到第6行，有几个允许代码通过编译并可以运行且无异常？（）
A.0
B.1
C.2
D.3

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