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问题 选择题

半径为15cm和13cm的两个圆相交，它们的公共弦长为24cm，则这个圆的圆心距等于[ ]

A.4cm

B.4cm或14cm

C.9cm

D.9cm或14cm

答案

答案：B

选择题
已知圆锥的母线长为6cm，底面圆的半径为3cm，则此圆锥侧面展开图的面积为（   ）
A、18πcm2
B、36πcm2
C、12πcm2
D、9πcm2
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单项选择题

What has happened to the Amazon jungle

A．Highways have been constructed through the jungle to help ease the traffic in the cities.

B．Jaguars, parrots and deer that once inhabited the jungle have left because me place was getting too hot for them.

C．The land has been cleared for growing soybeans because it is the most popular Brazilian food.

D．Fast economic development has brought devastating changes to the natural environment in Brazil.
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