单项选择题
The（）of such I. Q. tests full of questions on American culture was not questioned at that time.
A. significance B. validity C. efficiency D. justification
单项选择题 A good deal of the （） for his achievement in this field must go to his supervisor, Professor Fang.
单项选择题 Smoking is so harmful to personal health that it kills people each year （）than automobile accidents.
单项选择题 The microscope can （）the object 100 times.
