Roger Smith is a retail broker for TNT Securities, a small regional broker firm. As a CFA member, according to the Code of Ethics and Standards of Professional Conduct relating to knowledge of the law, he is most likely required to:（）

A. report violations of the Code of Ethics and Standards of Professional Conduct to appropriate regulatory organization.

B. dissociate from any activity that is believed to be illegal or unethical.

C. report violations of the Code of Ethics and Standards of Professional Conduct to CFA Institute.

男性，出生3天。生后第一天即出现呕吐，频繁呕吐黄绿色液，一直未排胎粪。查体：上腹略胀，腹软，未扪及包块，肠鸣音稍弱。

根据患儿情况，首先要做的检查是（）

A.CT扫描

B.腹部X线平片

C.结肠气钡双重造影

D.上消化道钡餐检查

E.B超检查