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

Now scientists have found in the past few years _________.

A．the exposure of DNA to the public is unnecessary
B．the tiny cell in DNA is a neat little machine
C．man knows nothing about DNA
D．man has much to learn about DNA

单项选择题

What can't be inferred from the 1st paragraph

A．Scientific experiments in the past three hundred years have produced many valuable items.
B．For three hundred years there have been people holding hostile attitude toward science.
C．Modern civilization depends on science so man supports scientific progress unanimously.
D．Three hundred years is not long enough to settle back critical appraisal of scientific method.

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