一级价格歧视和二级价格歧视在一定的条件下能达到完全竞争市场的社会总福利水平，三级价格歧视则不能增进社会总福利。()
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From the story, we know that Jon is ______.
A. a poor pupil in school
B. always doing what he likes
C. very creative in his study
D. a good listener in class
判断宏观经济结构均衡与否的主要观察对象是()
A. 产业结构
B. 产业组织
C. 产业布局
D. 产业关联
Why did Boost ask Macasso to paint a picture on the canvas？
A. To cover the original one.
B. To make it more valuable.
C. To change it from classic to modern piece.
D. To describe what London gas-works look like.
What do officials do during the game of football？
A. Watch the game.
B. Take up tickets.
C. Make sure the rules are followed.
D. Kick the ball.
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