The definition“Language is a tool for human communication.” has no problem.（）

Software products may be (1)into four basic types: application programs, programming language processors, operating systems, and system utilities.

Application programs are programs that (2) useful tasks such as solving statistical problems, or keeping your company's books.

Programming language processors are programs that (3) the use if a computer language in a computer system. They are tools for the development of application programs.

Operation systems are programs that (4) the system resources and enable you to run application programs.

System utilities are special programs that (5) the usefulness of or add capabilities to a computer.

A．manage

B．perform

C．support

D．reduce

E．divided

A.引用

B.定义

C.要素

D.选项

A.storage structure and access method definition

B.schema definition

C.integrity constrain specification

D.DDL

A、The definition for taboo

B、The definition for culture

C、The definition for customs

D、The definition for an individual style

A. as a flat file

B. as a BPEL-compiled definition

C. as an XML file with an associated document type definition (DTD)

D. as an XML file without an associated document type definition (DTD)

This passage is mainly about ______.

A) the definition of bacteria

B) health germs

C) probiotics

D) probiotics versus antibiotics