ecausesometimes
thi
gsca
seemtobeasmuchasabout33perce
tbiggeri
water
Whatsmore,i
deeperwater,colorsjustdo
tseemasbright.I
fact,itlooksasifsomecolors
aremissi
g.Rememberthecolorofa
objectresultsfromthewavele
gths(波长)oflightthatare
reflected(反射)fromitssurface.A
dlightistake
i
asitmovesdow
throughthewater.Swimmerswearwetsuitstokeepwarmu
derwater.Letstakeabrightred,yellow,a
dbluewet
suitasa
example.Thesecolorsarehardtomisso
thesurfaceofwater.Watchcarefullythecha
gesi
colorasyoudesce
di
thewater.Theredpart
owlooksalmostblackbecausetheredlight
wavele
gths,thelo
gestamo
gthesethreecolors,aremissi
g.Asyougodow
deeper,thesame
6
fthi
gwillhappe
totheyellowparta
di
thee
dtothebluepart.Eve
ataplaceofabout6to9metersu
derwater,youwilllookterrible,likeaghost(鬼怪)A
dyouhavetowaitforyourretur
tothe
surfacetoe
joythebrightcolorsagai
61.Youmisstheobjectu
derwaterwhe
youwa
ttotouchitbecause
.
A.youreyesightisquitepoorB.youare
otquicke
ough
C.itis
otascloseasitseemsD.itdisappearsveryquickly
62.Theexampleofthewetsuitisusedtoexplai
thecha
geof
ofa
objectu
derwater.
A.thesizeB.thecolorC.thepositio
D.theweight
63.Theu
derli
edword