∵x3+2x2=-xx+2，
∴x≤0，x+2≥0，
∴x的取值范围是：-2≤x≤0．
故答案为：-2≤x≤0．
用于胎盘滋养细胞和生殖细胞肿瘤的诊断或辅助诊断，以及治疗效果判断和随访的指标是（）
A.HCG
B.SCC
C.TPA
D.NSE
E.AFP
Jack tired to ____ his classmate Paul, but he wasn't____. [ ]
A. play tricks with; taking in
B. play tricks on; taking in
C. play a trick with; taken in
D. play a trick on; taken in
