填空题

What does David R. Smith want to convey when he says "... except when they’re magic" in the last paragraph

【参考答案】

It seems impossible to build a cloak people wish to have．
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To make metamaterials work for all lights in the visible spectrum is rather difficult because of the limitation of ______.
单项选择题
A．The woman is examining some old houses.B．The woman is going to rent the house.C．The woman is discussing the house condition with her colleagues.D．The woman is telling the man to change the wiring.
A．The woman is examining some old houses.
B．The woman is going to rent the house.
C．The woman is discussing the house condition with her colleagues.
D．The woman is telling the man to change the wiring.
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