The word "probe" in line 25 is closest in meaning to()
A. explore
B. influence
C. analyze
D. apply
Primitive humans probably did not (deliberately cook) food until (long) after they had learned (to use )fire for light and (warm.)()
A. deliberately cook
B. long
C. to use
D. warm
The word "precise" in line 13 is closest in meaning to()
A. planned
B. rational
C. required
D. accurate
According to the passage, the main disadvantage of person-on-the-street interviews is that they()
A. are not based on a representative sampling
B. are used only on television
C. are not carefully worded
D. reflect political opinions