已知C₄H₁₀的同分异构体有2种：CH₃-CH₂-CH₂-CH₃、则C₄H₉OH属于醇类的同分异构体共有（　　）

A．1种

B．2种

C．3种

D．4种

The（①） program means a program written in a high-level language.It is generally translated to an（②）program,which is in a form directly understandable by the computer.The translation is usually done by program called （③）. 

The（） program means a program written in a high-level language.It is generally translated to an（）program,which is in a form directly understandable by the computer.The translation is usually done by program called （）.

A．object

B．basic

C．C

D．assemble