[单选题]86、检伤分类的四个等级中第一优先救治（立即治疗/T1）的是
A.A 黑色标识
B.B 红色标识
C.C 黄色标识
D.D 绿色标识
E.E 以上都不是

{{B}} Questions 47 to 56 are based on the following passage.{{/B}}
Vegetarianism is the theory or practice of living solely upon vegetables, fruits, grains, and nuts—with or without the {{U}} (47) {{/U}} of milk products and eggs — generally for ethical, environmental or {{U}} (48) {{/U}} reasons. All forms of flesh (meat, fowl, and seafood) are {{U}} (49) {{/U}}from all vegetarian diets, but many vegetarians use milk and milk products.
In the early 21st century, vegetarianism has become decidedly mainstream. The number of vegetarians is difficult to determine, but a 2006 {{U}} (50) {{/U}} of 1,000 U.S. adults by the Vegetarian Resource Group found that 6.7 percent of respondents never ate meat, and 1.4 percent of those were vegan. A British survey the same year found that 12 percent of respondents called themselves "vegetarian". Many of today vegetarians came to the practice because they {{U}} (51) {{/U}}with sentiments about t