造成中枢神经系统血行感染的途径一般见于
A．昆虫感染
B．母婴传递
C．动物咬伤
D．输血
E．使用不洁注射器
参考答案：A,B,C,D,E
若|a|=5，b=3，则a+b等于[ ]
A．8
B．﹣2
C．8或﹣2
D．±8或±2
---Imagination important in science, and it helps us dream up our future.
---You are definitely right. If only something allow me to see insects and spiders magnified without getting close to them.
A．was; would
B．is; will
C．will be; can
D．is ;could
