题目内容
Which came first, the chicken or the egg? This is one of life’s __1__ questions and people have been debating about it for thousands of years. Now scientists believe they have solved this _2__. Researchers from Sheffield and Warwick Universities in England discovered the answer __3__. They used a super computer to observe the shell-making process while a new shell was __4__. Then they found one protein called OC17 that is __5__ for forming eggshell. This is only found inside a chicken’s body, which is proof that the _6__ came first. The team was __7__ looking at how animals and birds make eggshells but suddenly made their surprising __8__. The big question now is where chickens came from. The _9__ is from dinosaurs.
The research team said eggshells are one of nature’s most __10__ creations. Professor John Harding from the team told reporters: “Understanding how chickens make eggshells is fascinating in itself, but it can also be __11__ in designing new materials.” Eggshells are very lightweight but incredibly strong. Even the most up-to-date materials __12__ by the world’s top engineers can not produce anything as __13__ as an eggshell. Professor Harding added that __14__ eggshells could help to cure bone diseases and design materials for the construction industry.“Nature has found wonderful ways that __15__ for all kinds of problems in materials science and technology — we can learn a lot from them.” he said.
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【小题1】C
【小题1】A
【小题1】B
【小题1】D
【小题1】A
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【小题1】A
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【小题1】A
【小题1】C
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解析【小题1】C oldest“古老的”。
【小题1】A puzzle“难题，谜团”。
【小题1】B by chance“偶然”。符合题意。
【小题1】D shell-making process“蛋壳形成的过程”，故选D。
【小题1】A necessary，是蛋壳形成必须的。
【小题1】C chicken“(小)鸡”，蛋白质OC17只存在鸡的体内，故先有鸡。
【小题1】B originally“最初，起初”，起初在观察蛋壳如何形成时，
【小题1】D discovery“发现”。“突然发现了这个现象”。
【小题1】A“答案是鸡来自恐龙”。answer与question对应。
【小题1】D根据文意知，选D，蛋壳是自然界最令人惊异的发明之一。
【小题1】B helpful“有帮助的”。蛋壳能帮助组织新物质。
【小题1】C designed“被......设计”。
【小题1】A brilliant“灿烂的，光辉的”。形容蛋壳的优点。
【小题1】C研究团队是在“研究”蛋壳。
【小题1】B work for…“为......效力”。自然界蕴含解决各种问题的奇妙的的方法。
After spending a weekend away with my adult son, I was so impressed by his generous heart that I sent him this letter.
Dear son,
I want to thank you for teaching me a very valuable lesson in life by the great example you 31 . When we were eating at that cafe in Boston and a person who had 32 his hamburger didn’t have enough money to pay for it, without 33 , you went over and 34 the extra $2 into his hand.
When we were leaving, you 35 threw a five-cent coin onto the pavement and said something like, “Some kid will really enjoy 36 this.”
Last week, a young man 37 me in the line at a petrol station didn’t have 38 money to pay for his petrol. I asked the money collector, “How much 39 is he?” She told me he had meant to put $15 of petrol in his car 40 he had been looking at the wrong gauge (计量表) and had put in 15 41 , which came to a little over $20. That is an easy mistake as both gauges run fast.
Something made me think of you and 42 you did that night at the cafe in Boston. I handed the man $6. He was so 43 and said, “But why would you do this for me?” I just smiled as I thought of you.
Thank you, son, for teaching me that “it’s 44 to give than to receive”. Now when I see a five-cent coin on the 45 and want to pick it up, I think of you and leave it there, just in case some kid will get a kick out of finding it.
Love always, Mum.
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