在一个比例尺里，两个外项的积是最小合数，一个内项是8，另一个内项是______．
最小的合数是4，
另一个外项是：4÷8=0.5；
故答案为：0.5．
The main reason for the fast growth of population is not()a rise in birth rates as a fall in death rates as a result of improvements in public health service and medical care.
A. such
B. the same
C. so much
D. as much
病原携带者是指有症状而能排出病原体的人或动物。
