题目

某同学用两个弹簧秤做“探究两个力的合成”的实验，其中用到的一个弹簧测力计如图所示，则用它进行实验前应进行的操作是_____．接下来他的实验步骤如下：（1）在水平放置的木板上垫一张白纸，把橡皮条的一端固定在板上，另一端栓两根细线，通过细线同时用两个测力计互成角度地位橡皮条，使它与细线的结点到达某一位置O点，在白纸上记下O点和两测力计的读数F1和F2，以及两细线的方向．（2）只用一个测力计通过细绳拉橡皮条，使它与细线For my daughter's 19th birthday, we bought her tickets to go and see Linkin Park, as they were playing in our city. We didn't really have the    ____   but we knew how much this band meant to her.The night before she was like a  ____   at Christmas. Every so often she got up and came to    ____   with us, because she couldn't   ___. On the night of the   ____   it was good to see her so    ____    and excited, as she and her boyfriend set off.Needless to say when they   ____    after midnight, with T­shirts and lots of pictures of the band,    ____    her telling about how fantastic they had been, we knew the money had been well   ____. This will be a memory she would   ____   forget, and nor would we.____   full of excitement from the night before, the following day they   ___   to go shopping on the other side of the city. My husband and I   ____， loving the fact that she had not   ____ that quality as she grew up.Later that day they returned, with faces full of happiness and warmth. They presented my husband and me with a   ____    each. On each present were the words “Because you are the    ____   mum/dad in the world”. When we said our thank­yous and told her she didn't have to, we asked her   ____   she had bought us gifts. Her    ____   was simply “Just because I love you”．This wasn't something   ____    from our daughter; she had always given us a gift when she wanted to express her  ____， and each gift was always a welcome surprise. It could have been anything, it wouldn't have mattered, and it was  the act itself and the feelings behind it.小题1:A．moneyB．timeC．interestD．news小题2:A．workerB．babyC．kidD．parent小题3:A．danceB．learnC．walkD．sit小题4:A．speakB．sleepC．standD．leave小题5:A．concertB．holidayC．partyD．travel小题6:A．healthyB．happyC．prettyD．surprised小题7:A．stayedB．leftC．returnedD．turned小题8:A．worrying aboutB．caring forC．looking atD．listening to小题9:A．lentB．earnedC．savedD．spent小题10:A．everB．neverC．oftenD．neither小题11:A．StillB．OnlyC．JustD．Also小题12:A．continuedB．triedC．decidedD．struggled小题13:A．refusedB．criedC．shoutedD．laughed小题14:A．keptB．lostC．realizedD．discovered小题15:A．giftB．prizeC．ticketD．picture小题16:A．richestB．oldestC．bestD．cleverest小题17:A．whereB．howC．whenD．why小题18:A．wayB．answerC．suggestionD．idea小题19:A．importantB．ordinaryC．newD．valuable小题20:A．feelingsB．concernsC．understandingsD．opinions