15.一个长方体的高缩小到原来的$\frac{1}{2}$,要使它的体积变化,则( )
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| A. | 底面积扩大到原来的2倍 | B. | 长和宽都扩大到原来的2倍 | ||
| C. | 长不变,宽扩大到原来的2倍 | D. | 宽不变,长扩大到原来的2倍 |