题目

Mr. Smith has two cats. One is big and the other is small. He likes them very much. One day his good friend Mr. White comes to see him. He is very surprised(惊奇的).He finds there are two holes(洞) in the door, a big hole and a small hole. He says, “My dear friend, why are there two holes in your door?” “To let them in and out.” Mr. Black answers. “But why are there two holes?” his friend asks, “How can the big cat go through the small hole?”【小题1】Mr. Smith has _______.A．two small catsB．two big catsC．a big cat and a small oneD．a cat and a bird【小题2】Mr.下列与生长素无关的选项是（    ） A．向日葵花盘向着太阳转     B．倒伏的小苗又重新向上生长  C．有籽番茄的发育           D．马铃薯块茎的形成