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One of the first questions young children ask is “why?” is human nature to want to find out why things are the way they are.You can find out “why” by turning the question into a hypothesis(假设)forexperiment.For example, suppose you have been trying to grow tomato plants,insects keep destroying them.Someone tells you that putting large strips of colored cloth around the plants will keep insects away.Your question might be “Do certain colors of cloth keep insects away?” Then you’d begin your experiment.The first step would be to plant different-colored strips of cloth around all of the plants except one.regular intervals, you would observe and record and note the plant had any insects damage.This experiment may prove that the answer to your question is “No, it is not different-colored strips of cloth keep away insects.” Or you may find that the answer is “Yes, certain insects are kept away by blue, but not yellow cloth.”……you have found, you are well on your way to understanding how you can use scientific thinking to solve a problem in your own life.1.that/it2, an3, but4, at5, whether6, that7whatever
There is a photo(hang)above my desk.Whenever I look at that photograph, it takes me back to the end of the school year.I can still remember the shouts of the spectators as I sports field with my clamates.Two days earlier, I(qualify)for the finals of the 100 metres.Now looking around, I was determined(win).While I was walking acro to the start, I began to feel more and more nervous.I looked around and saw my proud parents waving enthusiastically.My heart was beating fast when I lined up with the other eager competitors.I took some deep breaths and waited for the signal.Then the(start)signal was given and I set off down the track.I ran as fast as I could.I could hear the crowd shouting excitedly, but the noise seemed very far away.By the time I croed the line I was so exhausted that I could hardly breathe.As soon as I heard the result(announce), I realize I had won!（excite）, I collapsed on the soft gra with a broad smile on my face.“ Well done!” said the Headmaster later, when I(present)with the winner’s certificate.I had never felt so happy and proud in my life.hanging2 went3 had been qualified4 to win5 starting6 announced7 excited8 was present
