河蚌体表贝壳是{"A":"\u7531\u5916\u5957\u819c\u7684\u5206\u6ccc\u7269\u5f62\u6210","B":"\u73cd\u73e0\u5c42\u4e0d\u6_刷题宝

题干

河蚌体表贝壳是（　　）

A：由外套膜的分泌物形成

B：珍珠层不断增厚形成

C：斧足不断运动的结果

D：水中某些物质在体表沉积形成

上一题下一题 0.0难度选择题更新时间:2014-07-02 05:52:13

答案(点此获取答案解析）

A

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