题目

My grandfather is a teacher. He is the head teacher of a school for boys between the ages of thirteen and eighteen. I know that he is a kind man, because he gives me presents, and let me sit on his knees（膝盖）, and tells me stories. But I believe(相信) the boys at his school are afraid of him. At school, when he walks into a room full of boys, they will be quiet at once. When he looks at a boy with a certain look in his eyes, that boy’s face goes red, and looks down at his shoes. If a boy brings careless（粗心的） work, my grandfather will pick up the boy’s book and th人与大猩猩的体细胞中染色体数量分别是A. 24对、23对 B. 23对、24对 C.都是24对 D. 都是23对