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Analysis: According to Article 10 of the Trademark Law, signs that are identical or similar to the national flag of the People’s Republic of China shall not be used as trademarks. The national flag of our country is the five-star red flag. It should be allowed to use "red flag" as a word trademark, so you cannot choose A for this question. Article 11, paragraph 1, of the "Trademark Law" stipulates: "The following signs shall not be registered as trademarks: (1) Only The common name, graphics, and model of this product; (2) It only directly represents the quality, main raw materials, functions, uses, weight, quantity, and other characteristics of the product; (3) It lacks distinctive features. It only directly expresses the function and use of mosquito repellent products and shall not be registered as a trademark. Item B is optional. "Bright" does not directly represent the function of the light bulb product. It can be registered as a trademark, but option C cannot be selected. "Red Sorghum" only directly represents the main raw material of the product and cannot be registered as a trademark. Item D is optional.

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