【简答题】There are many kinds of food in the world. Scientists learn a lot about them. They say that there are some kinds of food people must eat every day. For example, people must eat some green and yellow v...
【简答题】A.Insects are around long before people were. B.There are far more insects than there are humans. C.Insects lead a happier life than humans do. D.Insects are incredibly adaptable.