EBS 인터넷 수능...

but the corn standing all around you holds four hundred times as much carbon as there is in the man-made carbon
dioxide in the entire column. yearly, we manage, through agriculture, far more carbon than is causing our greenhouse dilemma.

두꺼운 글씨 문장에서요 than 뒤에 is가 어떻게 나온건가요???