填空题
There is always a "shadow" behind the uncloaked object because ______.
【参考答案】
the object causes an interruption in the electromagnetic wav......
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填空题
The invisibility cloak can make something invisible by wrapping ______.
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单项选择题
A．The engine of their boat stopped working.B．The were attacked by thunderstorm.C．They ran out of oil.D．They ran out of food.
A．The engine of their boat stopped working.
B．The were attacked by thunderstorm.
C．They ran out of oil.
D．They ran out of food.
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