师德修养的内涵非常丰富,它主要包括的内容是()
A、教师内在品质修养和外部行为修养
B、教师内在品质修养
C、教师外部行为修养
D、教师的敬业精神
参考答案:A
已知x+y=3,xy=2,求下列式子的值
(1)x2+y2;
(2)(x-y)2;
(3)x-y.
This kind of food ________ in the restaurants today. [ ]
A. served wide
B. can be served wider
C. is served wider
D. is widely served