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．mart knows nothing about DNA
D．man has much to learn about DNA

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单项选择题

The writer of the article was, undoubtedly ______ .

A．a linguist
B．an attorney
C．a scientist
D．an essayist

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.