右图为某遗传病图谱，如果4号与有病的女子结婚，则出现病孩的几率以及该病的遗传方式为（  ）

    Hello, my name is He Lin. I'm in Class2, Grade 7. There are forty-three students in my class, nineteen girls and ____ （二十四）boys. There is a ____ （电脑）on the teacher's desk and a TV in the____ （前面）of the classroom. Are there any photos on the classroom walls? Yes, there are. But there ____ （没有）a map of China or a map of the world on the wall. What about your class? How ____（多少）students are there in your class?

有人说：公平总是相对的，无论我们如何努力，都不可能达到绝对公平。所以我们就没有必要为了追求公平而努力了。

下列物质由分子构成的是（　）