Bill Gates, CFA, is a securities analyst covering transportation industry in a local broker. According to the Code of Ethics and Standards of Professional Conduct, which of the following recommended procedures to prevent violations of the Standards of Professional Conduct relating to priority of transactions is NOT accurate（）

A. Prohibit personal trading in the broker's recommended stock list.

B. Fully disclose to investors the broker's policies regarding personal investing.

C. Restrict investment personnel to participate on private placements.

根据《中华人民共和国合同法》，下列合同中，属于无效合同的有（）。

A．因重大误解订立的合同

B．一方以欺诈胁迫手段订立且损害国家利益的合同

C．限制民事行为能力人订立的合同

D．损害社会公共利益的合同

E．在订立时有失公平的合同