You have probably heard the expression，“It’s raining cats and dogs outside．”That means 16  it’s raining very hard I not that  17  cats and dogs are falling from the  18 ．However，one day in June，1882，it really did rain  19  over Dubuque，Iowa．The frogs  20  falling along with hailstones(冰雹)during a  21  storm．
Hail is formed when drops of rainwater are  22  by heavy winds and are carried high up into the air．There the raindrops become frozen．Many drops may freeze  23  to form balls of ice；these ice balls，or hailstones，then  24  to earth．
During the storm in Dubuque，the strong winds lifted small frogs from nearby ponds(池塘) 25  the air along with raindrops．When some of these frogs became covered with ice，both hailstones and“frog-stones”fell onto the ground．

A．that B．how C．why D．if

A．careless B．blind C．dead D．real

A．hill B．tower C．sky D．building

A．cats B．frogs C．dogs D．birds

A．stopped B．enjoyed C．began D．forgot

A．popular B．terrible C．weekly D．common

A．divided B．added C．changed D．caught

A．together B．alone C．so D．almost

A．hold B．lose C．keep D．fall

A．from B．into C．after D．by