托福考试

【单选题】About 75 percent of all cadmium is used for cadmium plating of （） such as iron and steel. 
A. easily corroded metals 
B. metals are easily corroded 
C. corroded metals that easily 
D. how easily metals corroded 

【单选题】A block and tackle is a （） of pulley blocks and ropes used for pulling or hoisting large objects. 
A. mechanical set special 
B. set special mechanical 
C. special mechanical set 
D. special set mechanical 

【单选题】thErE wErE onCE only Eight mAjor lAkEs or rEsErvoirs in tExAs, But toDAy thErE ArE ovEr 180, mAny Built to storing wAtEr AgAinst pErioDiC Droughts.

【单选题】thE unitED stAtEs soCiAl sECurity ACt, EnACtED in 1935, ContAinED thrEE mAjor progrAms A rEtirEmEnt FunD, unEmploymEntinsurAnCE, AnD wElFArE grAnts For loCAl DistriButE

【单选题】 Although have there been better singers and actresses than Ethel Waters, none typifies the rise from rags to riches more dramatically than she

【单选题】 The (oldest) public edifice in Washington D.C., the White House was (originally) constructed in the 1790's, (also) has been rebuilt or extensively remodeled (three times since).
A．oldest
B．originally
C．also
D．three times since

【单选题】 The word "sustain" in line 6 is closets in meaning to
A．( select
B．( strain
C．( support
D．( store

【单选题】 The word "undergone" in line is closest in meaning to
A．( altered
B．( substituted
C．( experienced
D．( preserved

【单选题】 Transistors (exhibit) a high amplification factor, operate without (distorted) over a (wide frequency) range, and can be made (extremely small).
A．exhibit
B．distorted
C．frequency
D．extremely small

【单选题】 The word "boosted" in line 3 is closest in meaning to
A．(ensured
B．(raised
C．(arranged
D．(discouraged