贫血的诊断步骤不包括（）。
A.了解贫血的程度
B.判断贫血的类型
C.先用铁剂治疗
D.了解贫血的原因
E.查明原发病
参考答案：C
用MCS-51串行口扩展并行I/O口时，串行口工作方式应选择方式（）。
A midday nap can not only ________ brain to its full awakeness best but also raise brain power beyond what it would have been without some shuteye.
A．accumulate
B．reserve
C．approve
D．restore
