统计资料表明，某国2013年8月份，工厂所在行业人才供求状况为：平均每天可支配时间16小时，平均每人每天如工作8小时，可得收入80元，此时需求量为20万人。1个月后，情况发生变化，每人可支配时间仍为16小时，只是如每人每天工作8小时，可得收入160元。但实际每人每天只工作6小时，此时，需求量为50万人。根据以上资料，回答下列问题：
工资率上升对于个人劳动力供给决策产生的作用为（）。
A.替代效应
B.互补效应
C.递减效应
D.收入效应
参考答案：A, D
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| Water, it’s a problem for the whole world. A bottle (瓶) of water may not seem like much to us, 1 it can help the people who live in drought-hit (遭受旱灾的) areas in China. In the past few months, many places in southwest China have 2 a serious drought. There has been very little 3 since last autumn. More than 20 million people are 4 trouble finding safe drinking water. After learning about the drought, many people around the country helped by 5 away water, money and other resources (资源) to the people there. Last week, the Young Pioneers and the Communist Youth League in China called on (号召) each student to give one bottle of water to the drought-hit area. In Xi’an, 900 students bought over 100 bottles of water 6 their pocket money. They also wrote their 7 on the bottles. “I hope you get more rain there. I hope you are happy.” A bottle of water isn’t much, but thousands of bottles will be very 8 . The serious drought has also made students 9 the importance of saving water. One student said, “I have decided to take a shower twice a week 10 every day to save water.” | ||||
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