2252+450×775+7752的值是( )。
A.169 345
B.100 000
C.1 000 000
D.108
参考答案:C
解析:原式可化为(225+775)2。
Only when he had done it ______ that he had made a mistake.
A.he then realized
B.did he realize
C.before
D.he realized
牛黄、熊胆都具有的功效是
A.开窍
B.化痰
C.明目
D.利咽
E.止痉