【名词&注释】
发电机、原子能(atomic energy)、匀速直线运动(uniform linear motion)、不一样(unlikeliness)、花样滑冰运动员(figure skater)
[单选题]做下列运动的物体，能当作质点处理的是
A. 自转中的地球
B. 旋转中的风力发电机叶片
C. 在冰面上旋转的花样滑冰运动员(figure skater)
D. 匀速直线运动的火车
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举一反三：
[单选题]
A. beyond
B. about
C. over
D. in
[单选题]Jae Kwon gave examples in Paragraph 4_________.
A. to show chemical batteries are widely applied.
B. to introduce nuclear batteries can be safely used.
C. to describe a nuclear-powered system.
D. to introduce various energy sources.
[单选题]The house I grew up ________ has been taken down and replaced by an office building.
A. in it
B. in
C. in that
D. in which
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