单项选择题

What was hailed as a biological revolution thirty years ago

A．Discovery of the structure of DNA
B．The decoding of the linear language
C．The mechanical device found in the human cell
D．The unbelievable complexity of DNA

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热门试题

单项选择题

Scientists have discovered in the past few years that ______.

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

单项选择题

According to the passage, a teacher's duty is to ______.

A．provide students with help when it is needed
B．find out students' mistakes and correcting them
C．teach students knowledge essential for their future life
D．help students find out correct answers