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讨论教学法需要确定讨论问题和小学生最后的解决问题的呈现方式作为实施前的准备条件。（） A. 对 B. 错

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Which of the following is true
A、Both forward and futures contracts are traded on exchanges.
B、Forward contracts are traded on exchanges, but futures contracts are not.
C、Futures contracts are traded on exchanges, but forward contracts are not.
D、Neither futures contracts nor forward contracts are traded on exchanges.