elephants eat about 100 kilos (of) food a day 为什么用of呢?

elephants eat about 100 kilos (of) food a day 为什么用of呢? The elephants eat 30 kilos of hay. about day eat manatees food 100 of a pounds 连词成句 The pandas usually eat 15 kilos of bamboo a day. we eat about 27000 kilos of food during our____(一生）适当形式填空 Pandas usually eat 15 kilos of bamboo a day 对画线部分提问画的15kilos pandans usually eat (15 kilos) of bamboo a day.(对括号里提问) T he monkeys eat 10 kilos of fruit every day (对10kilos提问） We eat a lot of ___(health) food every day.用适当的词填空 A manatee eat about 100 pounds of food___.A.a ,day B,every d The pandas usually eat 15 kilos of bamboo a day.这个句子有什么错?请改正 some of them eat this kind of food every day