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【单选题】
You don't understand the language and customs.
A.
Exchange programs are good.
B.
Exchange programs are difficult.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】You can learn about the food, holidays and customs.
A.
Exchange programs are good.
B.
Exchange programs are difficult.