It is well known of the __11__ of a possible earthquake, and for centuries man has been making researches on earthquakes. More than 2,000 years ago，__12__，a Chinese scientist named Zhang Heng __13__ a machine which could find out from which __14__ the seismic waves had come，and this machine is still __15__ by scientists today. Now we know much more about earthquakes and __16__ they happen，but we still cannot __17__ exactly when and where an earthquake will happen，and cannot __18__ it from happening. So earthquakes are among the __19__ disasters in the world.

　　No one can stop natural earthquakes. __20__，scientists can help stop earthquakes destroying the whole cities and causing too many deaths.

C．strange D．familiar

　　2．A.real B．weak

C．big D．small

　　3．A.moves B．shakes

C．jumps D．breaks

　　4．A.get B．put

C．set D．fall

　　5．A.off B．on

C．into D．behind

　　6．A.burst B．struck

C．destroyed D．buried

　　7．A.Except B．Besides

C．Instead of D．Because of

　　8．A.lonely B．later

C．themselves D．itself

　　9．A.follow B．copy

C．come D．enter

　　 10.A.quakes B．deaths

C．difficulties D．results

　　 11.A.information B．questions

C．dangers D．frights

　　12．A.as a result B．in fact

　　　　C．for example D．as well

　　13．A.invented B．discovered

　　　　C．found D．bought

　　14．A.country B．direction

　　　　C．way D．city

　　15．A.improved B．repaired

　　　　C．protected D．used

　　16．A.where B．when

　　　　C．what D．why

　　17．A.speak B．tell

　　　　C．talk D．point

　　18．A.make B．prepare

　　　　C．stop D．let

　　19．A.worst B．best

　　　　C．most D．fast

　　20．A.However B．But

　　　　C．And D．So

　　答案与解析：

1．解析：common意为"普通的，平常的"；unusual意为"异乎寻常的，不平常的"