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【单选题】
对脉管系统的描述中,错误的是 ( )A.
包括心血管系统和淋巴系统
B.
心血管系统由心、动脉、毛细血管和静脉组成
C.
淋巴管系统包括淋巴管道、淋巴器官和淋巴组织
D.
为开放的连续管道
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【简答题】阅读理解。 People make good use of time in America. Americans think much about time, and from childhood they learn to value time.As children, they are taught to be on time to go to school,to walk and to do...
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【简答题】阅读理解。 Americans think much about time . Form childhood they learn to value (珍视) time .They are taught to be on time to go to school , to work and to do everything . When they are having a good time, t...
【简答题】完型填空。 Americans think much about time. From children they 1 to value(珍惜)time. As children they are taught to be on time 2 to school, to work and to do everything. When they are having a good time, the...
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