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.
According to the passage, Einstein represents the people who
A. change the future of the world through individual insights.
B. write simple essays to make abstract theories understandable.
C. end wars without using forces.
D. make breakthroughs to shape the course of history.
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