</p> 练习:' ^' Y$ ~% R/ ~, M! I n: X
1.Harry Potter is mentioned in the passage,because scientists5 q$ `2 z5 C& R6 t8 O
Acan now make an invisible cloak of the same kind as he uses.
1 g- M6 ] D3 J/ V Btry to make an invisible cloak of the same kind as he uses.1 X) f% j8 j* @8 h% Z9 B( P6 s2 p
Ctry to invent a device Similar in idea to the invisible cloak he uses.: t+ z/ x2 \# q: l! K. ], g
Dknow that it is possible to make an invisible cloak of the same kind.
4 V$ a# M( T& S+ N% C# k: Z) c$ D 2.What is true of microwaves?' ?0 C" |0 B3 D
ATheir wavelengths are shorter than those of visible light.
: d& Z7 q! T0 k; p* A R BTheir wavelengths are longer than those of visible light.
, g. t4 X* i {2 G5 ^ CThey are different from visible light as they are a kind of radiant energy.
: u6 P# d/ `& K% I* u* g% |1 s DThey are visible to the human eye.
! s* k. v" w8 S% L, M, @7 y 3.What is NOT true of the invisibility device?! c) } O5 m) ^! D `
AIt is made of a special material with unusual ability.) M2 h c7 O) R; @. _3 A+ H
BMicrowaves bounce off it when they strike it.
" O% e5 @# m; J! G9 q CMicrowaves pass through it when they strike it.
* K! l" h# ^" G DIt bends the microwaves all the way around until they reach the opposite
( o4 M! I$ b( y1 J side.
1 O, l8 E; L$ ^ 4.What does the word “coaster” mean in the passage?
; W# v5 N9 |) e% ? AA disk or plate placed under a drinking glass to protect a table top.
^4 _) D) q- x BA vessel engaged in coastal trade.
+ z/ i1 b; x3 b% H. I4 i CA roller coaster.5 b% r) y9 I) Y! S! l0 E( p! e3 a
DA resident of a coastal area.0 Q' D+ t5 J T) n' B: M
5.Harry Potter’s invisibility cloak doesn’t have any real competition yet,& T# A: n8 V$ e
because
& G; |0 w9 ^& V Ascientists have not found out how his cloak works.
" c4 b5 s3 o2 y' h: F Bthe cloaking device is a total failure.
: Y& }) l5 Y- I& ^# q Cthe cloaking device works only for microwaves.
9 l9 X% Q3 I# _( Y
$ j8 ?' P& [$ m/ B Dthe cloaking device works only for visible light. |