There arecircles on the back and shoulders of Michael Phelps, which are marks left over from therapy.
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In China, people try cupping therapy when they have or muscles.
However, Westerners are by the marks and even fear that they might be aof the Zika virus.
In fact, cupping therapy looks , but actually it feelsand.
目前研究土的压缩性，均假定土的压缩主要是（ ）原因引起的。
A. 土粒的压缩
B. 孔隙中水的压缩
C. 孔隙中水和气体被排出
D. 以上都不对
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