能够通过生物富集作用使水生动物体内毒性成分含量增加的为______。
A.六六六
B.DDT
C.甲基汞
D.有机磷
参考答案:A,B,C
用所给词的适当形式填空,使句子意思完整通顺。
1. Some _____(Italy) will visit their university next week.
2. Jenny is one of the most _____(success) students in her class.
3. Linda’s_______(perform) at the party was well received.
4. The old doctor uses sport as part of his patients’ _____(treat).
5. Frank was the first to run across the ______(finish) line at the sports meeting.
职业性肿瘤的特点()。
A.接触明确的致癌因素
B.潜伏期长、发病年龄早
C.有一定好发部位
D.有一定的发病条件
E.以上全部