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    bsp;        D. called off 7.       Jenny complained that the hospital ______ her too much for the treatment. A. expended            B. paid                  C. cost                  D. charged 8.       Having decided to rent a flat, we ______ contacting housing agencies in the city. A. set about            B. set down           C. set out                     D. set up 9.       The book fair has received a positive ______ from readers. A. result                 B. response            C. settlement          D. solution 10.   If the operation ______ carefully prepared, it would not have been successful. A. was not              B. has not been      C. had not been      D. were not   II. Cloze Test (10 points, 1 point for each) ÏÂÁжÌÎÄÖÐÓÐÊ®¸ö¿Õ°×£¬Ã¿¸ö¿Õ°×ÓÐËĸöÑ¡Ïî¡£¸ù¾ÝÉÏÏÂÎÄÒªÇóÑ¡³ö×î¼Ñ´ð°¸£¬²¢ÔÚ´ðÌ⿨ÉϽ«ÏàÓ¦µÄ×ÖĸͿºÚ¡£ The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting  11  the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of  12  waves. Radio waves travel  13  the speed of light, about 300,000 kilometers in a second. A radar set  14  a short burst of radio waves. Then it receives the echoes  15  when the waves bounce (·´Éä) of objects. By determining the time it  16  for the echoes to return to the radar set, a trained technician  17  determine the distance between the radar set and other objects. The word ¡°radar¡±,  18 , gets its name from the term ¡°radio detection and ranging¡±. ¡°Ranging¡± is the term for detection of the  19  between an object and the radar set. Besides being of critical importance to pilot, radar is  20  for air traffic control, for tracking ships at sea, and for tracking weather systems and storms. 11. A. through               B. for                    C. on                    D. against 12. A. sound                 B. light                  C. heat                  D. tide 13. A. in                       B. at                      C. over                  D. on 14. A. sends out            B. works out          C. figures out         D. puts out 15. A. producing           B. produced           C. produce            D. produces 16. A. spends                B. takes                 C. kills                  D. makes 17. A. can                     B. must                 C. ought to            D. has to 18. A. in case                B. in turn               C. in short  &nbs s2007ÄêÓ¢Ó¶þ£©ÊÔ¾í¼°´ð°¸ Onlinepaycar Pt Sicht Online Pay Care i Online c2007ÄêÓ¢Ó¶þ£©ÊÔ¾í¼°´ð°¸ Onlinepaycar Pt Sicht Online Pay Carc Pay i Car Car Car