正常男孩体细胞中Y染色体一定来自于
A.外祖父
B.祖母
C.父亲
D.母亲
答案:C
题目分析:Y染色体是性染色体,只有男性才有的染色体,因此只能来自于男孩的父亲。
阅读加油站!阅读短文,回答问题。
One day, a duck swims in the river. A chicken goes for a walk on the riverside. Suddenly (突然), they see
some delicious (美味的) foods. Then they run to them at the same time. The chicken says, " I am taller than
you. I am more beautiful than you. And I am older than you. So I should eat more." " Oh, no!" says the duck.
" It's unfair (不公平) I see them first. And I am younger than you. I should eat more." They quarrel (争吵)
and quarrel. At last they eat nothing. Why? When they are quarrelling, a bird eats them all.
1. Who goes for a walk by the river?
2. Is the chicken younger than the duck?
3. Why are they quarrelling?
4. Do the chicken and duck eat the foods at last?
5. Who eats the foods?
凌迟之刑正式人律始于( )。
A.秦朝
B.宋朝
C.元朝
D.明朝