17．A．until

　　B．because

　　C．though

　　D．if

　　18．A．amazed

　　B．disappointed

　　C．shocked

　　D．frightened

　　19．A．call

　　B．return

　　C．ask

　　D．repay

　　20．A．lose

　　B．need

　　C．forget

　　D．borrow

　　Ⅲ．阅读理解

　　An accidental discovery has brought seismologists (地震学家) one step closer to being able to predict earthquakes．As part of an effort to measure underground changes caused by shifts in barometric pressure，a team of researchers found that increases in underground pressure came before earthquakes along California’s San Andreas Fault by as much as 10 hours．If follow-up tests confirm these findings，seismologists may eventually be able to provide a few hours’ notice for people to find a safe place before quakes．“Predicting earthquakes is the final goal for seismologists，” says Fenglin Niu，the research team’s lead author and a Rice University seismologist．“This is a start．”

　　The research team theorizes that the immense amount of pressure building along the Fault causes small cracks within the rock during the final hours before an earthquake，which increases rock density and slows the transmission signals．“The more cracks you have，the slower the seismic velocity (震波速度) will be，” says study co-author Paul Silver，a geophysicist with the Carnegie Institution of Washington．Still unknown is whether there is any significance to the fact that the magnitude-3 quake had a much longer pre-seismic signal than lower-magnitude quakes，or whether it was simply because its magnitude was larger and its epicenter (震中) was closer to the sensors．

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