阅读理解
Theymakepeoplescreaminfearyetpeoplepayforachancetoridethem.Whatarethey?Theyarerollercoastersofcourse.
Hundredsofrollercoastersmakepeopleexcitedatthemeparksaroundthecountry.ThefirstrollercoasterintheUnitedStateswasatrain.Peoplebuiltitin1800inordertocarrycoal(煤)downamountain.Whenitwasnolongerusedasacoaltrainitbegananewlifeasanamusement(娱乐)ride.Itwent18milesdownhillataspeedof6milesperhour.Theentireridelastedalmostthreehours.
Moderncoastertracks(轨道)aremeasured(计量)infeetratherthanmiles.Therideslastminutesinstead ofhoursbuttheyarefarmoreexciting.Somereachaspeedof100milesperhour.
Peoplestartedbuildingrealrollercoastersinthe1880s.Somegavesuchawildridethatpeopleoftengothurtonthem.Today'srollercoastersarenotdangerous.Safetybarsandharnessesholdridersinplace.Inadditionworkersspendfourhourseachdaycheckingthecoasters.Insomeparkscomputersmonitor(监控)thecoastersthroughouteachride.
根据短文内容，完成表格(每空一词)
RollercoastersinAmericaWhattheyare
Theymakepeoplescreamin(1)butpeoplestilllikeridingthem.
Thefirstrollercoaster
• Itwasfirstusedasa{2)train.
• Itmovedataspeedof6milesper(3) andtheridelastedalmost(4)hours.
Modernrollercoasters
• Theystartedinthelate19th(5)
• Thetracksweremuch(6)and theridestook(7)time thanheW
• Theyarefarmore(8).Atfirstsomewerequite(9)because ofhighspeeds.Buttodaytheyare(10)than beforebecauseofnarefnlnbpnVingandmonitoringeach day.