内部控制是一种合理保证，也存在局限性，不能提供绝对保证。()
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运用社会分层理论，谈谈我国改革以来社会分层结构的变化。
The text tells us that the universe______.
A. was formed by a random observer
B. has been in existence for an infinite amount of time
C. has undergone change over time
D. is constantly expanding
某些儿童出现吃土、煤渣等异嗜癖是营养性缺铁的症状。()
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