A:abundant
B:expensive
C:chea
D:colorful
A.液氧(支持燃烧)
B.金属铜(制电线)
C.活性炭(做防毒面具的吸附剂)
D.不锈钢(做水壶)
— Archimedes was really a wise man. He could easily ________ the king's problem.
— Yes, so he was. And he was also a great scientist who had a lot of ________.
下列各项中,有关生物与环境所蕴含的科学知识不相对应的是( )
下列有关实验现象描述正确的是 ( )