[简答]  二、阅读理解：结合上下文内容补全填空。（共50分）操作提示：通过下拉选项框选择正确的词汇。TheHistoryoftheInternet　　ManypeoplearesurprisedwhentheyfindthattheInternetwasinthe1960s.Atthattime,computerswerelargeandexpensive.Computernetworkdidn'tworkwell.Ifonecomputerinthenetwork,thenthewholenetworkstopped.Soanewnetworksystemhadtobesetup.Itshouldbegoodenoughtobeusedbymanydifferentcomputers.Ifpartofthenetworkwasnotworking,informationcouldbesentthroughpart.Inthiswaycomputernetworksystemwouldkeeponworkingonthetime.　　AtfirsttheInternetwasonlyusedbythegovernment,butintheearly,universities，hospitalsandbankswereallowedtouseittoo.However,computerswerestillveryexpensiveandtheInternetwasdifficulttouse.Bythestartofthe1990s,computersbecameandeasiertouse.Scientistshadalsodevelopedsoftwarethatmade“surfing”intheInternetmoreconvenient.