判断题

对于Ed=1的单一弹性的商品，降低价格或提高价格对厂商的销售收入都没有影响。()

答案：正确

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智能卡是通过嵌入式芯片来存储信息。()

答案：正确

单项选择题

She's got such a () attitude that it's depressing to be with her.

A、tough
B、cooperative
C、capable
D、negative