Unless plenty of visitors express their interests, we may not treat_______ to a supper with the author of this soon-to-be-released book.
A. they
B. their
C. them
D. themselves
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固定成本是指()
A. 企业在短期内必须支付的不能调整的生产要素的费用
B. 企业要增加产量所要增加的费用
C. 企业购买生产要素所需要的费用
D. 平均每单位产品所需要的费用
The phrase "One-stop shopping" in the last sentence of paragraph can be best defined by which of the following statements？
A. Each customer is allowed to carry one shopping cart or shopping basket.
B. The bus that takes customers to and from a supermarket has only one stop.
Customers may find almost everything they want in a large supermarket.
D. The supermarket has a turnstile that allows only one person to enter at a time.
当产量为3单位,固定成本为120元,可变成本为90元时。平均成本为()
A. 10元
B. 30元
C. 40元
D. 70元
土地利用的集约化程度。一般来说利用集约程度愈高的土地，其经济供给亦随之减少。()
A. 正确
B. 错误
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