单项选择题

The writer's main purpose in writing the passage is to say that ______ .

A．science is just at its beginning
B．science has greatly improved man's life
C．science has made profound progress
D．science has done too little to human beings

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单项选择题

Special words used in technical discussion ______ .

A．never last long
B．should be confined to scientific fields
C．may become part of common speech
D．are considered artificial language speech

单项选择题

The author's main purpose in writing die passage is to ______ .

A．describe a phenomenon
B．propose a solution
C．be entertaining
D．argue a belief