钻孔取土器应根据土样质量级别和土层性质选用，对于采取Ⅰ级原状试样，必须选用薄壁取土器，采取Ⅱ级原状试样，可选用薄壁取土器或厚壁取土器，Ⅲ、Ⅳ扰动样则不需取土器。
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What happened to Lisa after a mouth operation?
A. She spoke with a Texas accent.
B. She spoke with a British accent.
C. She returned to her normal life.
D. She needed to have another operation.
Why was Lisa embarrassed?
A. Because she hadn’t been to England yet.
Because she hadn’t watched any British movies.
C. Because she didn’t want to see people play around.
D. Because she didn’t like to speak with a British accent.
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