You have an Exchange organization that contains Exchange 2000 Server Service Pack 3 （SP3）， Exchange Server 2003 Service Pack 2 （SP2）， and Exchange Server 2007 Service Pack 1 （SP1） servers. You need to transition the organization to Exchange Server 2010. What should you do first？（）
A. Remove all Exchange Server 2007 SP1 servers from the organization.
B. Remove all Exchange 2000 Server and all Exchange Server 2003 servers from the organization.
C. Remove all Exchange 2000 Server servers from the organization，and then upgrade all Exchange Server 2007 servers to SP2.
D. Remove all Exchange Server 2003 servers from the organization，and then upgrade all Exchange Server 2007 servers to SP2.
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《机动车维修企业质量信誉考核办法（试行）》规定，机动车维修企业质量信誉考核实行计分制，考核总分为1000分，维修质量和服务质量考核共占（）分。
A. 200
B. 400
C. 500
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