第27题: [单项选择]Questions 27—30 are based on the passage about sign language. You now have 20 seconds to read Questions 27—30.Which of the following was NOT used by Native Americans to make a signal A. A small horse. B. Cigarettes. C. A mirror. D. Fire arrows. 参考答案:B 答案解析:短文中提到印第安人用的几种方法,如“a Native American might ride a small horse. He might use smoke. a mirror or fire a