</p> 练习:
5 P$ w1 L' l% p# D1 s9 P 1.Harry Potter is mentioned in the passage,because scientists
, C% c" ~+ V) d6 S. d0 P/ J Acan now make an invisible cloak of the same kind as he uses." q; Q5 Q- Y a+ p3 o. Q% ]
Btry to make an invisible cloak of the same kind as he uses.* b# ~$ Z5 q5 i2 W/ D
Ctry to invent a device Similar in idea to the invisible cloak he uses.
/ M$ Y$ p) b- `6 {' Z Dknow that it is possible to make an invisible cloak of the same kind.4 f' _, y# ~ g/ P N+ i
2.What is true of microwaves?
! o/ ^ S" q5 O- _" i* ~ ATheir wavelengths are shorter than those of visible light.
" T& o2 d6 R5 k' \ s BTheir wavelengths are longer than those of visible light.6 n* N# X/ p) e2 S- _. e6 j
CThey are different from visible light as they are a kind of radiant energy., F% u7 f/ P. e$ X% j/ i8 g1 k0 u
DThey are visible to the human eye.4 p$ R8 z V" ~7 o1 F6 ]. b7 @
3.What is NOT true of the invisibility device?
0 s# K7 o/ m0 K& L, V AIt is made of a special material with unusual ability.
9 D" |* O' y6 j `( O3 l @2 G0 x BMicrowaves bounce off it when they strike it. a7 ~: `2 A! r' g& v
CMicrowaves pass through it when they strike it., X3 E( x+ }5 H/ i# D
DIt bends the microwaves all the way around until they reach the opposite2 M4 R6 B9 B) `, G% A
side." z6 L7 g4 I/ T" _1 G
4.What does the word “coaster” mean in the passage?( n' G" g+ q3 l. F2 r7 E2 W8 C4 z0 l
AA disk or plate placed under a drinking glass to protect a table top.
1 m* G4 C% |/ x; S4 q6 \9 c BA vessel engaged in coastal trade.
2 F/ U/ d1 o6 T( u' K- @ CA roller coaster.
6 Y4 Q- P( ^. j$ b DA resident of a coastal area.
8 d# A& `2 ^6 e) G) y. q 5.Harry Potter’s invisibility cloak doesn’t have any real competition yet,6 h) `9 y' X/ C: B$ i( D
because( t2 |# r; {$ I* f
Ascientists have not found out how his cloak works.
1 n3 ^1 [. o( A0 J! V h# ? Bthe cloaking device is a total failure.; a( n' k3 E$ S
Cthe cloaking device works only for microwaves.: g, P- W/ |: U0 p0 `2 K' ~
1 B. ^1 X+ D8 Y
Dthe cloaking device works only for visible light. |