问答题

Clocks operate with gears. So do cars and so does the device invented by the Indian scientists to produce electricity

【参考答案】

钟表是由齿轮来驱动的。汽车和这种印度科学家发明的发电设备也是一样的。
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So far the research has suggested that only the emotional effects of memories may be reduced, not that the memories are erased.
单项选择题
Which of the following is true about the device mentioned in the passage
A．It has a large gear and a smaller gear.
B．It’s easy to use, but difficult to move.
C．It’s quite cheap.
D．It’s still being tested.
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