因式分解:-m2+n2=( )。
(m+n)( m-n)
交感神经兴奋可以()
A.降低肝糖原分解
B.减弱糖异生
C.使胰岛素分泌增多
D.升高血糖
E.降低血糖
--Could you please tell me ________?
--Sure. Only ten minutes' walk.
A. how soon he will be back
B. how long have you been here
C. how far it is from the park