上述各因素中最可能致肝癌的是()。
A.长期饮用含藻类毒素的宅沟水或井水
B.职业性接触石棉
C.人 * * 状瘤病毒18型感染
D.职业性接触联苯胺
E.职业性接触铅
参考答案:A
_____ at his knowledge, all the students showed their respect for their teacher.
A.Amazed
B.Being amazed
C.Amazing
D.Having amazed
简述1~6个月儿童心理发展的主要特点。