1. The river widens considerably as it begins to tum east.
　　A.extends
　　B.stretches
　　C.broadens
　　D.traverses
　　2. There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.
　　A.beats
　　B.matches
　　C.maintains
　　D.announces
　　3. The attack on Fort Sumter near Charleston provoked a sharp response from the North,which led to the American Civil War.
　　A.demanded
　　B.elicited
　　C.extracted
　　D.defied
　　4. Illinois has produced writers such as Carl Sandburg,gangsters such as Al Capone,and architects such as Louis Sullivan.
　　A.violent criminals B.politicians
　　C.musicians
　　D.industrialists
　　5. The towers of a suspension bridge serve as a rigid framework to which the cables are attached.
　　A.boundary
　　B.skeleton
　　C.enclosure
　　D.material
　　6. The use of the chemical may present a certain hazard to the laboratory workers.
　　A.protection
　　B.indication
　　C.immunity
　　D.danger
　　7. Many economists have given in to the fatal lure of mathematics.
　　A.error
　　B.function
　　C.attraction
　　D.miracle
 

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