The world  79  many interesting sounds. Some are unpleasant to our ears while  80  are very pleasant to hear. In a single day you probably hear  81  sounds. All sounds are  different. Some  82

loud ,some sounds are high, others are low ,some sounds are useful.  83  Sound we can not talk or listen to each other. The ringing of the alarm clock wakes people up .the hooting of a car warns people of danger.

Some sounds are harmful. When plans fly low  84  the land .the very loud sounds can damage the house. Very loud sound can even make people deaf.

We know sound travels about one kilometer in three  85 . in a thunder storm you see the lighting first and then hear the thunder.

Divide this number  86 this will tell you  88   kilometers away the thunder storm is  88   .

(  ) 79. A. full of        B. fill with       C. is filled of     D. is filled with

(  ) 80. A. others        B. the other      C. another       D. the others

(  ) 81. A. hundreds of        B. hundred of     C. Hundreds      D. hundred

(  ) 82. A. may          B. Maybe           C. may be        D. can

(  ) 83. A. of           B. with          C. without       D. By

(  ) 84. A. in           B. on           C. above         D. over

(  ) 85. A. hours         B. days          C. minutes       D. seconds (秒)

(  ) 86. A. more fast      B. much faster        C. more faster     D. much faster

(  ) 87. A. in           B. of           C. by           D. at

(  ) 88. A. how mach     B. how many     C. how          D. how long

 0  220645  220653  220659  220663  220669  220671  220675  220681  220683  220689  220695  220699  220701  220705  220711  220713  220719  220723  220725  220729  220731  220735  220737  220739  220740  220741  220743  220744  220745  220747  220749  220753  220755  220759  220761  220765  220771  220773  220779  220783  220785  220789  220795  220801  220803  220809  220813  220815  220821  220825  220831  220839  447090 

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