Today the forests have almost gone. People must_____down too many trees.          [ ]

A. stop froming cutting        

B. stop to cut          

C. be stopped from cutting    

D. be stopped to cut

患者，女，21岁。鼻出血、牙龈出血、皮肤瘀斑3d。查体：体温38.3℃，皮肤大片瘀斑，胸骨压痛，血常规 WBC 2.0×10⁹/L，Hb 80g/L，PLT 5×10⁹/L。

为明确诊断首选的检查为

A．骨髓检查

B．血培养

C．血小板抗体

D．过敏原检测

E．贫血系列