依法执教是教师的责任，与学生、家长、学校、社会毫无关系。
参考答案：错
After 15 years in the USA, he has finally decided to _____ American citizen-ship.
A．care for
B．apply for
C．wait for
D．prepare for
锅炉燃油系统由哪些组成？燃气系统由哪些组成？
