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

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热门试题

单项选择题

The author's main purpose in writing the passage is to______.

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

单项选择题

The writer of the article was, undoubtedly______.

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