In ancient times, dogs were mainly ______helping people hunt( 打猎) .Now they are more useful-they can help the blinds, search for the bad eggs.

A．bad for

B．used to

C．used for

D．good at

七岁女孩，10天前发热、咽痛，近2天浮肿、尿少，尿色较深。体检：神志清，四肢轻度水肿，压之凹陷不明显，咽充血，心、肺、腹无异常，血压12／9kPa（90／68mmHg），拟诊急性，肾小球肾炎。

应首先做下列那项检查（）。

A.血常规

B.尿常规

C.胸部X线透视

D.心电图

E.咽拭培养