How does Josh help homeless people?
A. By giving them some food.
By giving them some money.
C. By giving them haircuts for free.
D. By giving them a chance to talk.
查看答案
Why does Josh help homeless people?
A. Because he can practice his skills.
Because these people like his haircuts.
C. Because other people don’t want to help.
D. Because his help can make them feel good.
学习本课程需要的几个非常重要的工具书有？
A. 中国居民膳食营养素参考摄入量
B. 中国居民膳食指南
C. 中国居民平衡膳食宝塔
D. 中国食物成分表
E. 营养均衡理论
在某一时期内彩电的需求曲线向左平移的原因是
A. 彩电的价格提高了
B. 消费者对彩电的预期价格上升
C. 消费者对彩电的偏好下降
D. 消费者的收入水平提高了
某种商品需求价格弹性为2，价格为10元/个，需求量为2000个，当价格降为8元/个时，总收益会变为多少钱？（公式：Ed=-(∆Q/Q）/（∆P/P））
A. 22400
B. 20000
C. 19600
D. 16000
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