单选题 A red flag was placed there as a {{U}}token{{/U}} of danger.
  • A. sign
  • B. substitute
  • C. proof
  • D. target
【正确答案】 A
【答案解析】[解析] 考查名词。题干划线词token意为“符号,标志,表征”,与sign语义相近,所以答案为A。