患者女，5岁，因“恶性淋巴瘤”行化学治疗。化学治疗6d后出现发热、腹痛3d，少尿1d。查体：T39.5℃，P160次/min，R30次/min，BP80/40mmHg；体重20kg；意识清楚，嗜睡，面色苍白；双肺呼吸音对称，未及啰音；心音有力，律齐；腹软，肝、脾肋下未及，肠鸣音减低；四肢暖，足背动脉搏动可及，四肢肌张力正常，CRT5s。SaO95%。

为明确诊断应紧急检查的项目包括（）

A.血常规

B.尿常规

C.粪常规＋隐血试验

D.动脉血气分析

E.血细菌培养

F.血电解质

G.血糖

H.骨髓穿刺细胞学检查

Why did the early settlers come to America? Who were the Pilgrims? Who were the Puritans? What were the features in the colonial period which had influence on later American development?