操作系统是现代计算机必不可少的系统软件之一。下列关于操作系统的叙述，错误的是_______。
A. Linux操作系统是由美国Linux公司开发的
B. Unix操作系统是一种多用户分时操作系统，可用于PC机
C. 目前WindowsXP操作系统有多个不同版本
D. WindowsServer2003操作系统属于网络操作系统
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纳税人购买国债并于持有到期后取得的利息收入，免征企业所得税。所谓国债利息收入，不包括国家发行的金融债券利息收入。 ()
A. 正确
B. 错误
A．respectivelyB．togetherC．totallyD．regularly
A. respectively
B. together
C. totally
D. regularly
James Q. Wilson supports Mary Eberstadt's new book because
A. he thinks the most important factor in shaping the character of our children is parental care.
B. he agrees that it is our culture that weakens families.
C. the way America treats its kids is somewhat similar to the way one treats his dog.
D. he is the author of The Marriage Problem: How our culture has weakened Families.
The author's attitude toward American moral values may be
A. critical.
B. suspicious.
C. indifferent.
D. approval.
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