—I hear Jane has gone to the Holy Island

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问题选择题

— I hear Jane has gone to the Holy Island for her holiday.

— Oh, how nice! Do you know when she _____? [ ]

A. was leaving

B. had left

C. has left

D. left

答案

答案：D

填空题

根据首字母提示或所给单词的正确形式完成句子

1. —Why are you late again?

—Sorry, I o ______ this morning.

2. By the time they got to the cinema, the film ______ ( begin).

3. By the time I called him, he ______ ( fall)asleep.

4. When she reached the shop, she suddenly remembered she ______(leave) her purse at

home.

5. When I ______ ( get) to school, I realized I ______(leave) my backpack at home.

问答题

假设在某寡头行业中，如果一家寡头厂商提高价格，则其他寡头厂商一般会保持其价格不变；但如果该寡头厂商降低价格，则其他寡头厂商会选择采取相同的降价措施。试分析在上述假设的前提下寡头厂商的需求曲线和边际收益曲线的基本特征。