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Natural languages are designed to facilitate the communication between humans. Programming languages are designed to facilitate the communication between human and computers. A programming language is a notation for describing computation in computer-readable and human-readable form.
A programming language represents a special vocabulary and a set of grammatical rules for instructing a computer to perform specific tasks. Broadly speaking, it consists of a set of statements or expressions understandable to both people and computers. People understand these instructions because they use human (English and mathematical) expressions. Computers, in the other hand, process these instructions through use of special programs, which, known as compiler, decode the instructions from people and create machine-language coding.
Just like we have many different languages in use throughout the world for us humans to communicate with, there are different languages that we use to communicate with a computer . There are three levels of programming languages:
Machine language
Assembly language
High-level language

choose the best answer according to the passage .(根据上文的内容选择正确的答案。)
1. Programming languages are designed to facilitate the communication between human and .( A )
A. computers B. people C. hardware D. software
2. A programming language is a notation for describing computation which can be understand by both . ( C )
A. computer and machine B. human and software
C. computer and human D. software and hardware
3. Computers understand the programming language through ( B ) , which translate the programming language into machine-language that computer can understand.
A. assembly language B. compiler C. machine language D. high-level language
4. The following are the three levels of the programming language except .( D ).
A. machine language B assembly language. C. high-level language D. compiler
5.which of the following language can be directly understood by computer? ( A )
A. machine language B. assembly language C. high-level language D. compiler

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