黄曲霉毒素引起的致癌性试验中，最敏感的动物是（）。
A.豚鼠
B.大白鼠
C.猴子
D.鸭雏
E.鸡
参考答案：B
The matter__________your study surely requires__________carefully.
A．relating to；dealing with
B．related to；dealt with
C．related to；being dealt with
D．relating to；having dealt with
简述导游证与导游人员资格证的区别。
