练习:
% J" Y) X; Y, S9 P6 b 1.Harry Potter is mentioned in the passage,because scientists
* h2 r- v% {- ~- _) w4 c/ y Acan now make an invisible cloak of the same kind as he uses. * Y0 T& y+ a' H3 F/ ~$ _: ?- v+ a
Btry to make an invisible cloak of the same kind as he uses.
0 `; d* c# P m4 }& I Ctry to invent a device Similar in idea to the invisible cloak he uses.
) b: P& ?& ^6 D5 U Dknow that it is possible to make an invisible cloak of the same kind.
" H2 n+ c8 q- e: X5 c 2.What is true of microwaves? % B9 J" R' _3 r! Z+ U* f
ATheir wavelengths are shorter than those of visible light.
4 z0 t D5 Y8 C$ o5 ]# k% l BTheir wavelengths are longer than those of visible light.
% u# G. s* [. B' j9 [ CThey are different from visible light as they are a kind of radiant energy. w/ f- |3 C- k. f1 z( `
DThey are visible to the human eye. $ J; J2 R" X) ^. T
3.What is NOT true of the invisibility device?
7 z8 y( V- y, u* M$ m5 ` AIt is made of a special material with unusual ability.
3 s; O9 Y* k$ ~/ H/ d BMicrowaves bounce off it when they strike it.
1 t/ @& l" H% Z1 ?. Y1 g/ D CMicrowaves pass through it when they strike it.
6 E4 x6 V$ y7 x DIt bends the microwaves all the way around until they reach the opposite side. 7 v6 H; i3 f9 y7 r
4.What does the word “coaster” mean in the passage? 外语学习网- e& e! O4 a3 o4 M& P& H
AA disk or plate placed under a drinking glass to protect a table top.
# |* a+ [4 Q" M+ ~, _1 L BA vessel engaged in coastal trade. 5 A# {+ g c& ]! ]
CA roller coaster. * C6 p7 S1 b j( k9 w
DA resident of a coastal area.
9 q% T Y0 k" i' G 5.Harry Potter’s invisibility cloak doesn’t have any real competition yet,because
5 [' [2 {; ?3 [9 E Ascientists have not found out how his cloak works. 1 `. _) U6 V9 `# ^3 j
Bthe cloaking device is a total failure. 外语学习网$ o$ o6 X; v$ d- U, d( S1 G
Cthe cloaking device works only for microwaves. # y8 z1 _) B( V
Dthe cloaking device works only for visible light. |