安全阀是对锅炉的安全保护起着重要的作用安全附件之一，它对锅炉内部( )的控制起着重
题型：单项选择题
问题：
安全阀是对锅炉的安全保护起着重要的作用安全附件之一，它对锅炉内部( )的控制起着重要的作用。
A．温度极限值
B．压力极限值
C．可燃物浓度极限值
D．水位极限值
题型：单项选择题
阅读文章，回答问题。（10分）
Hello, boys and girls. Let me tell you something about our art room. In my school, there is an art room. It is clean. (1) There is a teacher and twenty students in it now. There are twenty desks in it. (2)Two desks ______ big and eighteen desks are _____. There are three balls and five boxes on the 
small desks. On the small desks, there are eighteen pen
cils and fifteen rubbers. There are thirteen pictures and a poster on the wall. We are very happy in the art room.
小题1: 把（1）处下画线的句子译成中文。
小题2:在（2）处填上适当的词，使句子通顺正确。 __________
小题3:回答问题：What’s on the small desks?
小题4:在文中找出与所给句子意思相近的句子。We have an art room in our school.
.
小题5:在文章中找出主题句（中心句）将其写在下面横线上。