单项选择题

What does the author think is the best way for children to learn things

A．By making mistakes and having them pointed out by others.
B．By having their mistakes corrected.
C．By noticing their problems and making changes.
D．By listening to explanations from skilled people.

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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

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．For centuries scientific discoveries have been hailed by the human world unanimously.
D．Three hundred years is not long enough to settle back for critical appraisal of the scientific method.