26. 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.
27. The principle discovery in this century shows .
A) man has overthrown Newton’s laws of physics
B) man has solved a new set of gigantic puzzles
C) man has lost many scientific discoveries
D) man has given up some of the once accepted theories
28. 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









