路由策略实施的两个步骤（）
A.编写策略
B.应用策略
C.修改策略
D.优化策略
参考答案：A, B
Many a student _____ playing games on the playground and only one girl or two _____ reading in the classroom.
A．are; are
B．is; is
C．are; is
D．is are
姬氏或瑞氏染色时，疟原虫中红染部分叫
A．细胞质
B．血红蛋白
C．红细胞
D．细胞核
E．疟色素
