According to the text, the problem with the study of human nature is______.
A. that it is mysterious
B. insights lead to more questions and mystery
C. it is almost always used for the wrong purposes
D. there are too many competing theories
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土方开挖一般按照土石方的坚硬和开挖难易程度分为哪四类？
基层农村的网格化治理，就是将村民根据一定的地域条件、人口规模进行适度划分，形成一个基层社会控制的小单位。()
2018年，中国农村居民人均可支配收入达到14617元，增速连续9年超过城镇居民收入。()
The privilege against self-incrimination can be found in______.
A. Supreme Court opinion
B. prison rules and regulations
C. state law governing prisons
D. the U.S. Constitution
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