草履虫不具备下列哪个特点（）A．身体由一个细胞构成B．能在水中自由运动C．能对外界刺激作出反应D．有起支持和保护作用的细胞壁-七年级生物

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• The mountain was ______ steep ______ few people in our city reached the top.A．so; asB．so; thatC．as;
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