流行的网络拓扑结构有：总线型结构、()、环型结构、分布式结构以及树型结构等。
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流行的网络拓扑结构有：总线型结构、星型结构、环型结构、分布式结构以及()等。
If a person returns to his home country after a long enough visit to a host country, he may
A. obtain better abilities to adapt to a new environment.
B. regain some of the initial positive regard.
C. no longer live in small towns.
D. go through the four stages of cultural shock again.
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