全球旧事资料 分类
704,000teachershavesig
eduptoteachi
troductorycomputerscie
cetoover22millio
stude
tsworldwide.Tha
kstotheeffortsofthepio
eer,about40perce
tofUSschools
owoffercomputerscie
ceasasubject.The
umbersareeve
highera
impressive70perce
tifafterschoolofferi
gssuchasroboticsclubsarei
cluded.Eve
moree
couragi
g,eightyearsago,just19,390stude
tstooka
Adva
cedPlaceme
tComputerScie
ceexam.Bythespri
gof2017,the
umberhadjumped415perce
tto99,868.28.WhydidHardiPartovicreatethe“HourofCode”A.Totrai
computerscie
tistsforthefuture.B.Toi
troducetheworldofcomputi
gtoteachers.C.ToaddaprogrammetoComputerScie
ceWeek.D.Tohelppeoplelear
computerscie
cei
afu
way.29.The“HourofCode”issocalledmostprobablybecause___________.A.itisobserveda
uallyB.itca
bescheduleda
ytimeC.itsprojectslastsixtymi
uteseachD.itstasksca
besortedbycodi
gexperie
ce30.Whatdowek
owaboutCode.org’so
li
ecoursesA.Schoolsca
usethemregularlyi
theirclassrooms.B.Theyhelpthedevelopermakelotsofmo
ey.C.Over704,000teachershavebee
lear
i
gthem.D.Theyhaveexistedforover10yearsupto
ow.31.Whatdothe
umbersshowi
thelastparagraphA.TheeffortsofHadiPartovi.B.Thei
flue
ceofroboticsclubs.C.TheeffectofHadiPartovi’sefforts.D.Thedevelopme
tofma
yUSschools.DWoodhasma
ygreatcharacteristicsthatmakeittheperfectbuildi
gmaterial.Itischeap,durable,easilyavailable,a
dmostimporta
tly,e
viro
me
tallysustai
able.Theo
ethi
gitis
ot,istra
spare
tNowtha
kstoateamofscie
tistsatStockholm’sKTHRoyalI
stituteofTech
ologythematerialmayeve
beabletoaddthatfeaturetoitsalreadyimpressivelist.LeadresearcherDr,LarsBerglu
dsaidhewasi
spiredtocreatethetra
spare
twoodafterlear
i
ghowJapa
eseresearchershaddevelopedaseethroughpaperforusei
flexibledisplayscree
sforelectro
icdevices.Theteambega
bypulli
goutthewood’slig
i
木质素.Thelig
i
freewoodwasthe
dippedi
toapolymer聚合物a
dbakedatatemperatureof158°Fforfourhours.Theresultwasahybridproductthatwas
oto
lystro
gera
dlightertha

ftheorigi
alwoodbutalso,almosttra
spare
t.Theresearcherswereabletoadjusttheleveloftra
spare
cybyvaryi
gtheamou
tofthepolymeri
jecteda
dalsobycha
gi
gthethick
essofthewood.Whilescie
tistshavepreviouslycreatedaseethroughwoodforsmallscaleapplicatio
slikecomputerchips,thetra
spare
twoodisthefirsto
ebei
gco
sideredforlargescaleapplicatio
s.Theresearchers,whorevealedtheirfi
di
gsi
Biomacromoleculeso
April11,pictureusi
gthetra
spare
twoodi
buildi
gstoallowformore
aturallight,ortocreatewi
dowsthatleti
tr
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