B．catch the thief

　　C．the thief being caught

　　D．the thief to be caught

　　答案　C　[考查lead to的用法。句意：新证据的发现导致了这个贼的被抓。lead to表示“导致”，to是介词，因此后面跟名词或动名词；因为thief和caught之间是动宾关系，因此用被动形式。故选C。]

　　15．April 1st is a special day，________practical jokes may be played without punishment.

　　A．in which

　　B．on whichC．with which

　　D．for which

　　答案　B　[考查“介词＋which”在定语从句中的用法。先行词为a special day，故表示在某一天应用介词on。选B。]

　　Ⅳ.阅读理解

　　A

　　Scientists in the United States have developed a computer program that they say could provide an early warning of major earthquakes. The new system is designed to give warnings seconds before an earthquake strikes.

　　That may not sound like very long. However, it could give people time to get under a table or take shelter someplace safe.The flow of electric power or gas could be cut off. Air traffic controllers could warn away pilots.Even so­called“smart buildings”could be designed to get ready.

　　The system uses a mathematical program to measure information collected by instruments deployed across the Los Angeles area. Southern California has more than 150 seismic(地震的)stations that measure movements within the ground.The information they collect is sent to a high­speed computer.

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