Answer: ABCD[Hint] This question examines the circumstances in which the marks shall not be used as trademarks

Article 10 of the "Trademark Law" stipulates: "The following signs shall not be used as trademarks: ① Same as in China The name, national flag, national emblem, military flag, and medals of the People's Republic of China are the same or similar, as well as the name of a specific place where the central state agency is located or the name or figure of a landmark building; ② The name of a foreign country is the same , national flag, national emblem, military flag are the same or similar, except with the consent of the government of the country... ⑤ The name or symbol is the same as the "Red Cross" or "Red Crescent"..." According to this article, item A It shall not be used as a trademark; item B is similar to the name of the United States of America "United States of America" ??and shall not be used as a trademark; items C and D are directly prohibited by item 5 above.