What does the word “field” mean in the sentence “Some people are worried that electromagnetic fields from electric power lines could increase the risk of cancer.”?
选项:
A: an area of grass, for example in a park or on a farm ;
B:an area of land or sea bed under which large amounts of a particular mineral have been found;
C:an area in which that particular force is strong enough to have an effect;
D:a particular subject of study or type of activity
发布时间:2024-03-29 20:08:07