下列词语中，划线字的读音全都正确的一组是  (　　)

人体内氧气和血红蛋白分离的场所是肺泡外的毛细血管。（判断对错）

定义运算：$a\otimes b=\left\{\begin{array}{c}a,\left(a\le b\right)\\ b,\left(a>b\right)\end{array}\right.$，则函数f（x）=1⊗2^x的图象是（　　）

    Mr. Brown is a teacher. He is from New York, America. He would like（想）to work in China because he likes our country. He thinks Chinese people are very friendly and he likes to live in China. He is happy to work in our school. He likes the school life here. He teaches English. There are 50 students in his class. Mr. Brown is kind. He and his students are good friends, too.
    Now some of Mr. Brown's students play sports on the playground（操场）. Bill and Mike play tennis. Tom and John play ping-pong. The other students play basketball. Mr. Brown is happy to play basketball with them. They have a good time.
阅读上面的短文，根据短文内容，选择最佳选项。   

下面是几个同学对基因表达的理解，你认为其中错误的是（  ）