Which may be the best title of the passage？
A. What Is the Market
B. Selling and Buying
C. Things the Market Sells
D. What Can the Market Do for You
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"Concrete" probably means ______ in the passage.
A. possible
B. impossible
C. almost the same as abstract
D. the opposite of abstract
One's identity refers to ______.
A. one's name, sex, age, and nationality
B. who he thinks he is and what he thinks he can do
C. who he is to marry and how they will live
D. what one believes in and how he does something for himself
阅读下面代码 ByteArrayOutputStream bout=new ByteArrayOutputStream()； ObjectOutputStream ut=new ObjectOutputStream(bout)； out.writeObject(this)； out.close()；
A. 将对象写入内存
B. 将对象写入硬盘
C. 将对象写入光盘
D. 将对象写入文件
单位对外提供财务会计报告的责任主体是会计机构负责人。()
A. 正确
B. 错误
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