高处坠落是危险点控制措施的重点，但机械伤害不是危险点控制措施的重点。
参考答案：错
--Mike, pay attention to the teachers carefully in class, you'll fall behind.
--I will. I know nothing is difficult if you put your heart into it.
A. listening to
B. listen to
C. listen
（）是美国的土著居民
