Invisibility Ring

　　When a person sees an object，his or her eye senses many different waves of visiblelight as they bounce off the object.The eye and brain then work together to organize thesesensations and reconstruct the objects original shape. So，to make an object invisible，scientists have to keep waves from bouncing off it.And they have to make sure the objectcasts no shadow.Otherwise，the absence of reflected light on one side would give the obiectaway.

　　The scientists new invisibility device is the size of a drink coaster and shaped like aring.The ring is made of a special material with unusual ability.When microwaves strike thering，very few bounce off it.Instead，they pass through the ring，which bends the waves allthe way around until they reach the opposite side.The waves then return to their originalpaths.

　　When the researchers put a small cdpper loop inside the ring，it，too，is nearly invisible. However，the cloaking device and anything inside it do cast a pale shadow.And the deviceworks only for microwaves，not for visible light or any kind of electromagnetic radiation.So，Harry Potters invisibility cloak doesnt have any real competition yet.

　　1.Harry Potter is mentioned in the passage，because scientists

　　Btry to make an invisible cloak of the same kind as he uses.

　　Dknow that it is possible to make an invisible cloak of the same kind.

　　ATheir wavelengths are shorter than those of visible light.

　　CThey are different from visible light as they are a kind of radiant energy.

　　3.What is NOT true of the invisibility device?

　　BMicrowaves bounce off it when they strike it.

　　DIt bends the microwaves all the way around until they reach the opposite

　　4.What does the word coaster mean in the passage?

　　BA vessel engaged in coastal trade.

　　DA resident of a coastal area.

　　because

　　Bthe cloaking device is a total failure.

　　Dthe cloaking device works only for visible light.

　　C文章的第一段告訴我們，科學(xué)家還沒有發(fā)明哈里波特使用的那種隱身衣，所以不能選 A;該段還告訴我們，科學(xué)家已制造了，一種裝置，這種裝置能使自身或置于其中的物體不被微波發(fā)現(xiàn)，所以C是正確選擇，也就是說，科學(xué)家發(fā)明的隱形裝置和哈里波特的隱身衣僅僅在概念上相同，這同時說明B和D是錯誤的選擇。

　　B第四段第三句說，當微波到達裝置表面時，very few bounce off。very few是幾乎沒有的意思，所以選擇B。其他選擇所述內(nèi)容都可以很容易在該段中找到。

　　CA句在短文中沒有提到;按文章的內(nèi)容B不是正確的說法;文章最后一段說，And thedevice works only for microwaves，not forvisible light，所以C是正確選擇

　　Invisibility Ring

　　When a person sees an object，his or her eye senses many different waves of visiblelight as they bounce off the object.The eye and brain then work together to organize thesesensations and reconstruct the objects original shape. So，to make an object invisible，scientists have to keep waves from bouncing off it.And they have to make sure the objectcasts no shadow.Otherwise，the absence of reflected light on one side would give the obiectaway.

　　The scientists new invisibility device is the size of a drink coaster and shaped like aring.The ring is made of a special material with unusual ability.When microwaves strike thering，very few bounce off it.Instead，they pass through the ring，which bends the waves allthe way around until they reach the opposite side.The waves then return to their originalpaths.

　　When the researchers put a small cdpper loop inside the ring，it，too，is nearly invisible. However，the cloaking device and anything inside it do cast a pale shadow.And the deviceworks only for microwaves，not for visible light or any kind of electromagnetic radiation.So，Harry Potters invisibility cloak doesnt have any real competition yet.

　　1.Harry Potter is mentioned in the passage，because scientists

　　Btry to make an invisible cloak of the same kind as he uses.

　　Dknow that it is possible to make an invisible cloak of the same kind.

　　ATheir wavelengths are shorter than those of visible light.

　　CThey are different from visible light as they are a kind of radiant energy.

　　3.What is NOT true of the invisibility device?

　　BMicrowaves bounce off it when they strike it.

　　DIt bends the microwaves all the way around until they reach the opposite

　　4.What does the word coaster mean in the passage?

　　BA vessel engaged in coastal trade.

　　DA resident of a coastal area.

　　because

　　Bthe cloaking device is a total failure.

　　Dthe cloaking device works only for visible light.

　　C文章的第一段告訴我們，科學(xué)家還沒有發(fā)明哈里波特使用的那種隱身衣，所以不能選 A;該段還告訴我們，科學(xué)家已制造了，一種裝置，這種裝置能使自身或置于其中的物體不被微波發(fā)現(xiàn)，所以C是正確選擇，也就是說，科學(xué)家發(fā)明的隱形裝置和哈里波特的隱身衣僅僅在概念上相同，這同時說明B和D是錯誤的選擇。

　　B第四段第三句說，當微波到達裝置表面時，very few bounce off。very few是幾乎沒有的意思，所以選擇B。其他選擇所述內(nèi)容都可以很容易在該段中找到。

　　CA句在短文中沒有提到;按文章的內(nèi)容B不是正確的說法;文章最后一段說，And thedevice works only for microwaves，not forvisible light，所以C是正確選擇