Some species are better learner than others partly because______.
A. some animals prefer to remain dumb
B. some animals don"t have a nervous system
C. learning may endanger some animals" health
D. they are better taught than others
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荀子强调的“修身” ，包括 () 和() 两个方面。
气瓶检验单位应该按照有关安全技术规范和检验标准规定进行定期检验，检验项目()增减。
A. 可以
B. 不可以
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
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？
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