词汇:</p>backpack/5bAkpAk/n.背包 watt/wCt /n.瓦(特)+ j' P$ T) b& B$ ~' K' i+ @
receiver/ri5si:vE(r)/n.接收机 gait/eit/n.步态,步法- W$ R5 ?2 _4 A: Z/ ?
night-visiongoggle 夜视镜 oscillation/7Csi5leiFEn/n.摆动6 U/ p2 ?4 ? a6 r! o3 G- _/ Y9 _
spring/spriN /n.弹簧 commercialize/kE5mE:FElaiz/v.商业化1 g' r( V: r. d
vertical/5vE:tikEl /adj.垂直的 mountaineer/7maunti5niE(r)/n.登山运动员
3 c% v: m1 ^7 A3 Z# \- C, Jrotary/5rEutEri /adj.旋转的
& H. q, ]" M! U" x- ?/ Z: Y+ e$ Y: x练习:
+ Z& ?) O: O4 l1. Backpacks are convenient because
1 S. _. P& h% bA they can be verylarge.4 Y7 x4 |% ~) i$ n
B they can hold as many things as you want to carry.
: u! ~3 _2 @: j# dC your handsare freed to do other things.+ o4 Y/ ~2 M0 M% ?3 }
D you do not have to carry things withyou.
, ~5 m4 ^- Q# {2. What is the most important feature of the backpack invented byLawrence C.Rome' u9 _/ y' M0 l0 b6 {
and his colleagues?; m+ _. v5 u- K4 b7 d' H
A It produces electricity forelectronic devices while the wearer walks.$ k' D: _5 t$ s9 K+ Q
B It can be used as cellphones,GPS in the military actions or field studies.' h! B: Y! H. l& p8 C7 ]
C It is small andconvenient.- B! s ?0 U! J
D It is light and easy to carry.
# V: p- g+ R; E0 T3. The word "springs" inParagraph 3 means
$ u) l; a0 e& c% F6 TA a small stream of water flowing naturally from theearth.* d2 }7 q6 g& E6 K. T& n( m
B the season of the year,occurring between winter and summer.
( [/ M0 P7 e* p I) V& aC the act or an instance of jumping or leaping.9 ^, R2 B% B. E/ V
D a length of metal woundaround,which returns to its original shape after/ M" ~" s1 ?" _7 C- ` M; l
being pushed. |