16-20為題組
       You might have heard the expression “raining cats and dogs.” The origin of theexpression might be linked to the city of London in the 17th century. At that time, thestreets of London were filled with stray animals. When the streets flooded after heavyrains, those animals, __16__ cats and dogs, would be seen floating down the streets,as if they were raining down from the sky. It is unlikely to see a rain of cats and dogsin real life. __17__ , in some places, there has been “rain” of fish, frogs, and otheranimals or objects. There are reports of strange rain with snakes, seeds, nuts, stones,and even golf balls. This actually happens more often than you think. Peoplethroughout history have been __18__ by the strange rain phenomenon. Scientists canexplain some strange rains though: An unusual rain of animals or objects is usuallycaused by a tornado. A tornado __19__ things from the ground in its violent path,travels with the things for a distance, and then drops them in another spot. A small bodyof water such as a lake or a pond could also be __20__ up into the air, along with fishand other species in there, by the tornado. This “water tornado” carries fish or frogsfrom a pond and “rains” them down in another place.
【題組】16.
(A) regarding
(B) assigning
(C) counting
(D) including