常见的基因病不包括（） A.体细胞遗传病 B.单基因病 C.多基因遗传病 D.分子病

75比8多多少？

文中共有10处语言错误。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线 \ 划掉。修改：在错的词下划一横线，并在其下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Mark Twain, like you know, was famous in his days as the public speaker. He always liked to play joke

on his friends. One day, the one of his friends lost their wallet and asked him to buy a train ticket for him.

“But I don’t have enough money to pay both your ticket and mine,” Mark Twain said. The friend didn’t

know what to do. “Let’s do this, “ Mark Twain saying, “You can get off the train and when the conductor

comes to check the ticket you can hide under my seat.” Later, however, when the conductor comes to check

the ticket, Mark Twain gave him two tickets-----one for him and the other for his friend.

学龄前儿童膳食中优质蛋白质应占蛋白质总量的( )。

A．20%

B．30%

C．40%

D．50%

在面向对象数据结构模型中，对对象标识的说法正确的是( )。

A．在整个系统中不能重复

B．在整个系统中可以重复，但在一个独立模块中不能重复

C．可以定义一个主对象标识和若干次对象标识

D．以上说法都错误

泥质岩类岩心的层面上常分布（）。

A.石膏、菱铁矿

B.黄铁矿、云母片

C.气孔、流纹构造

D.搅混构造