∵x=2-1，
∴x+1=2，（x+1）2=2，
∴x3+2x2+x+2
=x（x+1）2+2
=（2-1）•2+2
=22．
He is old. He is my .[ ]
A. little brother
B. grandmother
C. grandfather
慢性锰中毒时（）
A.白内障
B.锥体外系损伤症状
C.迟发性脑病
D.腕下垂
E.易兴奋症
