单项选择题

A．An educational problem.
B．A health problem.
C．A Chemical problem.
D．An environmental problem.
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单项选择题
The access part of ADA is extremely complicated, so_______.
A．those greedy attorneys take its advantage to make profit
B．it has effectively guaranteed the rights of those handicapped
C．there are inevitably some flaws
D．the handicapped show no interests in it at all
单项选择题
________ countries have worked together to build the International Space Station.
________ countries have worked together to build the International Space Station.
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