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问题 选择题
把一根长9分米的长方体木料，平均锯成三个小长方体，表面积增加了2.4平方分米，这根木料的体积是（　　）立方分米．
A．3.6B．5.4C．7.2D．10.8
答案

答案：B

选择题
As a coach, you should know clearly about the direction _____ your team should develop.

A. to which
B. from which
C. in which
D. for which
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解答题

大小两个圆的半径分别是10 cm和5cm，大圆面积比小圆面积多多少平方厘米？
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