单项选择题

Please match the following reference with its category.
Flege, J. (1999) 'Age of learning and second language speech' in Birdsong, D. (ed.) Second Language Acquisition and the Critical Period Hypothesis. London: Lawrence Erlbaum Associates 101-32.
A、A book by one author
B、A book by two authors
C、A journal article
D、A chapter in an edited book
E、An anonymous web page

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阅读下面的程序:def func():print(x)x=100func ()执行上述语句后,输出的结果为( ) A.
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