【单选题】Researchers suspect that the average number of units earned per semester by college students is rising. A researcher at Calendula College wishes to estimate the number of units earned by students duri...
A.
all Calendula College students
B.
all college students
C.
all Calendula College students enrolled in the spring
【简答题】A.Food production increases faster than population growth. B.The rate of population growth exceeds that of food production. C.Population and food supply increase proportionately. D.Population growth s...