下列哪些做法和行为会破坏生态环境 [ ]
A.要想富,先种树
B.围湖造田,填海造田
C.建立自然保护区
D.将捕捉到的毒蛇放回大自然中去
答案:B
Most of the older civilizations which flourished during the fifth century B.C. are died out .
A.they have died out
B.has died out
C.have died out
D.they had died out
有机磷杀虫剂、氨基甲酸酯杀虫剂等中毒()
A.昏迷
B.谵妄
C.惊厥
D.肌纤维颤动
E.瘫痪