10. The experiments in giving the virus to animals proved that this type of influenza was easy to catch __________.
A. but was not deadly.
B. and had rather mild effects.
C. and could possibly causes death.
D. and did not have the usual signs.
11. In order to keep track of a disease such as influenza, W.H.O. must have ________.
A. highly trained experts.
B. co-operation from every doctor.
C. good reporting services.
D. time to study the facts.
12. One thing necessary for discovering influenza outbreak is __.
A. doctors and hospital services.
B. drugs to fight the disease.
C. the United Nations.
D. sick Chinese.
D
It is true that as a social organization moves from the simple to the complex, so does the organization through which it educates its children. Growth and change are vital if education is to meet new needs and demands. In a very simple social order it may suffice(足够) to have the parents carry on the education of their children.