A:蜻蜓的幼虫
B:蝴蝶的幼虫
C:小鸟的幼虫
D:青蛙的幼虫
若1a-1b=4,则a-2ab-b2a+7ab-2b的值是____
比大小(用“>”“<”“=”符号填空)
7×9____8×9
All the students p____ at the lecture were deeply touched by his success story.
—She____(visit) her grandparents. She usually____(visit) them on Sundays. She____(visit) them again this Sunday.