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a与b被m除后余数相同的等价关系式是（）。
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更加贴近现实,但精确性、信度效度有所减弱的实验设计是()。
被试间设计可能会因为练习效应而产生结果偏差。
Cet-6-1.17-Exercise 01Yet there are doubts whether people watching television, a “lean back” medium, crave interaction. Click-through rates have been high so far (around 3–4%, compared with less than 0.3% online), but that may be a result of the novelty. Interactive ads and viewers might not go well together. How does the author view the hitherto high click-through rates?
Cet-6-1.17-Exercise 02Economic inequality is the “defining challenge of our time,” President Barack Obama declared in a speech last month to the Center for American Progress. Inequality is dangerous, he argued, not merely because it doesn’t look good to have a large gap between the rich and the poor, but because inequality itself destroys upward mobility, making it harder for the poor to escape from poverty. “Increased inequality and decreasing mobility pose a fundamental threat to the American Dream,” he said. How does Obama view economic inequality?
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