单项选择题

Which of the following solutions is the one the author will agree to

A．Legalizing the illegal immigration.
B．Facilitating the legal immigration.
C．Building a long fence along the border.
D．Stationing a huge army defending the border.

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单项选择题

ACM SIGCHI Conference on Human Factors in Computing Systems was held in the city of

A．Halifax.
B．Minneapolis.
C．Los Angeles.
D．San Francisco.

单项选择题

Which of the following conferences was held in Maringa-Parana Brazil

A．ACM Conference on Computer Supported Cooperative Work.
B．ACM SIGCHI Conference on Human Factors in Computing Systems.
C．1st Workshop on Human Factors in Computational Systems.
D．2nd International Conference on AUTONOMOUS AGENTS.