The particular design of muscles and bones in the neck and limbs of the turtle allow that it can draw in its exposed parts such that an attacker can find nothing but hard shell to bite.
allow that it can draw in its exposed parts such that
allow it to draw in its exposed parts, and so
allows for it to draw in its exposed parts and that
allows that it can draw in its exposed parts, and so
allows it to draw in its exposed parts, so that
D选项的and so表示前面整句话的结果,但是原文不表示整句话而只表示that后面的句子。
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