单项选择题

A．Declining health.
B．Lack of attention.
C．Loss of motivation.
D．Improper behavior.
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单项选择题
A．It can be used by farmers to protect large buildings.B．It was brought to the northern USA by Asian farmers.C．It has done more harm than good in the southern USA.D．It was introduced into the USA to kill harmful weeds.
A．It can be used by farmers to protect large buildings.
B．It was brought to the northern USA by Asian farmers.
C．It has done more harm than good in the southern USA.
D．It was introduced into the USA to kill harmful weeds.
单项选择题
When there are no efficient doctors in large population centers, epidemics start.
A．Y
B．N
C．NG
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